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Review

Skin Manifestations and Coeliac Disease in Paediatric Population

by
Flavia Persechino
1,†,
Gloria Galli
2,†,
Severino Persechino
3,
Francesco Valitutti
4,
Letizia Zenzeri
5,6,
Angela Mauro
5,
Vito Domenico Corleto
2,
Pasquale Parisi
6,
Chiara Ziparo
6,
Melania Evangelisti
6,
Giovanna Quatrale
6 and
Giovanni Di Nardo
6,*
1
Department of Clinical and Molecular Medicine, Sapienza University of Rome, 00185 Rome, Italy
2
Department of Medical-Surgical and Translational Medicine, Sant’Andrea University Hospital, Sapienza University of Rome, 00185 Rome, Italy
3
Dermatology Unit, NESMOS Department, Faculty of Medicine & Psychology, Sapienza University of Rome, Sant’Andrea University Hospital, 00185 Rome, Italy
4
Pediatric Unit, AOU San Giovanni di Dio e Ruggi D’Aragona, Salerno, Italy and EBRIS (European Biomedical Research Institute of Salerno), 84121 Salerno, Italy
5
Pediatric Emergency Unit, Emergency Pediatric Department, AORN Santobono-Pausilipon Children’s Hospital, 80129 Naples, Italy
6
Pediatric Unit, NESMOS Department, Faculty of Medicine & Psychology, Sapienza University of Rome, Sant’Andrea University Hospital, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
†
These two authors contributed equally to the manuscript.
Nutrients 2021, 13(10), 3611; https://doi.org/10.3390/nu13103611
Submission received: 27 August 2021 / Revised: 12 October 2021 / Accepted: 13 October 2021 / Published: 15 October 2021
(This article belongs to the Special Issue Nutrition Therapy for Diarrhea in Cancer and Severe Illness in Patients)
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Abstract

:
Celiac disease (CD) is an immune-mediated enteropathy caused by gluten ingestion, affecting approximately 1% of the worldwide population. Extraintestinal symptoms may be present as the first signs of CD, years before the CD diagnosis is made. A great variety of extraintestinal manifestations may be associated with CD. Cutaneous manifestations represent the main extraintestinal manifestations, with dermatitis herpetiformis being the most common in patients with CD. In adults, it has been demonstrated that the role of a gluten-free diet is crucial not only for the recovery of signs and symptoms associated with CD but also for cutaneous manifestations, which often improve after gluten avoidance. In children with CD, the association with skin disorders is well documented regarding dermatitis herpetiformis, but studies considering other dermatological conditions, such as psoriasis and atopic dermatitis, are few. The prevalence and manifestations of dermatological disorders in celiac children are often different from those in adults, explaining the gap between these populations. In addition, the therapeutic role of a gluten-free diet in the improvement in skin alterations is not fully understood in children and in adult population except for dermatitis herpetiformis. Therefore, cutaneous CD symptoms need to be known and recognized by physicians despite their specialties to improve early CD diagnosis, which is critical for a better prognosis. This review describes the current scientific evidence on skin manifestations associated with CD in the pediatric population.

1. Introduction

Celiac disease (CD) is a systemic immune-mediated condition characterized by an aberrant response to wheat gliadins and other cereal prolamins that causes small intestinal enteropathy and a wide range of symptoms in genetically susceptible individuals [1]. In the pediatric population, the actual prevalence of the disease in many Western countries ranges from 0.10% to 3.03%, with a significantly increasing annual trend [2]. Concomitant with the increase in CD incidence, changes in its clinical presentation have been described in the past few decades. A higher number of asymptomatic cases together with an increase in the number of “non classical” presentations, including extraintestinal symptoms such as iron deficiency anemia, altered bone metabolism, short stature, elevated liver enzymes and skin manifestations, have been detected by targeted screening of at-risk groups [3]. A recent study showed that non intestinal symptoms were the most commonly represented symptom in 43% of pediatric CD patients [4]. Nevertheless, the clinical presentation of the disease can often be misleading as highly variable from one patient to another, leading to frequent delays in diagnosis [1]. Therefore, extraintestinal CD needs to be recognized by physicians of various specialties, including gastroenterologists, internists, pediatricians, neurologists, dermatologists, gynecologists, and particularly general practitioners.
CD patients also present an increased risk for autoimmune disorders compared to healthy controls, with a prevalence ranging from 14% to 27% [5,6]. In addition, a higher prevalence of CD has been recognized in patients with a number of autoimmune disorders, warranting however an active screening only in a few diseases, such as type I diabetes mellitus [7]. There are some hypotheses related to this association: the shared genetic features between CD and the other immune-mediated disorders, the alteration of the intestinal barrier, and a similar environment trigger [8]. The loss of the intestinal barrier permeability could be related to both local and systemic inflammation triggered by lymphocytes T activation induced by gluten with the subsequent release of proinflammatory cytokines [9]. Even if not yet fully understand, the beneficial effect of the start of GFD observed in some concomitant autoimmune disorders could be partially secondary to the end of this immunity process and the consequent reduction in the release of the proinflammatory cytokines trigger [10].
Among extraintestinal CD manifestations, there are many cutaneous diseases. Skin diseases associated with CD have been classified into those improved by a gluten-free diet (GFD) and those occasionally associated with CD [11]. The risk to develop skin disorders is higher at the CD diagnosis but persists beyond 10 years [12].
In this review, the main features of skin diseases with a proven association with CD and those improving after a GFD are described in children. Moreover, other pediatric skin conditions sporadically associated with CD are briefly reported. In particular, we aim to improve the early recognition of CD-associated skin manifestations, recommending active case finding for CD and thus reducing the risk of diagnostic delay.

2. Dermatitis Herpetiformis

Dermatitis herpetiformis (DH) is a chronic, itchy, gluten-triggered skin disorder whose features are subepidermal granular IgA deposits leading mainly to papulovesicular lesions [13,14].
Links between CD and DH have emerged in recent decades: the disappearance of the skin rash on a GFD, the occurrence of both conditions within families and the overlapping human leukocyte antigen (HLA) [15,16,17]. Approximately 85% of DH patients with a Caucasian background carry HLA-DQ2, while most others carry HLA-DQ8 [18]. Even though DH is not uncommon among adolescents, it is rarely observed before puberty, with most children being diagnosed between the ages of 2 and 7 years [19,20].
DH is most prevalent in individuals of Northern European descent. In adults, men with DH slightly outnumber women by nearly 1.5:1 [21,22,23]; nevertheless, there is a female predominance in the pediatric population, and it seems more prevalent in Mediterranean areas [24,25]. At present, the DH-to-CD prevalence is 1:8 [26].
The clinical picture of DH is characterized by papulovesicular lesions and urticarial plaques, which are intensively itchy and symmetrically distributed, typically affecting the extensor surfaces (elbows, knees, and buttocks) [26]. As the lesions are strongly pruritic, typical vesicles are rarely apparent since they turn into excoriation (Figure 1). DH presents similarly in children and adults; however, children might have uncommon skin findings, such as solitary involvement hemorrhagic lesions of the palms and soles, as well as deep dermal papules/nodules and facial lesions [27,28].
Acral purpura and petechiae are a common finding among DH patients and may even indicate an early-stage disease: these hemorrhagic skin lesions affect the fingers and the toes primarily and are referred to as digital purpura [29].
In this case, 25% of DH patients have normal small bowel villous architecture or minor changes in terms of increased intraepithelial lymphocytosis [30,31]. However, whether villous atrophy is present in DH patients does not affect the long-term prognosis of skin lesions [31].
Instead, DH is now a common extraintestinal manifestation of CD occurring in up to 10% of CD patient series in Europe and North America, but it has also been described more recently in other geographical areas [32,33]. DH patients rarely complain of gastrointestinal symptoms, albeit sometimes these subjects can remain unaware of those before diagnosis [34].
Intriguingly, features of DH and CD (without visible skin lesions) can alternate in the same person or their family members during different periods of life, thus tightly embedding the two diseases within the same spectrum [35,36].
Direct immunofluorescence (DIF) microscopy is the gold-standard procedure for DH diagnosis; however, it should be noted that false-negative immunofluorescence results occur in approximately 5% of cases, especially if blisters or inflamed skin areas have been biopsied. The key elements for diagnosing DH at DIF are granular IgA deposits in the papillary dermis of peri-inflamed areas [37]. IgA granular deposits may persist even decades after commencing a strict GFD [38]; thus, in doubtful cases, DH diagnosis can also be ratified afterwards, without necessarily reintroducing gluten.
Conventional histopathological examination of DH lesions shows neutrophilic micro-abscesses in the dermal papillae with or without subepidermal blisters [39]. Nevertheless, these findings are not fully specific to DH, as similarities can be detected in other blistering skin diseases [40]. Therefore, it is still under scrutiny whether a biopsy for conventional histology is mandatory since granular IgA deposits at DIF, together with a compatible clinical picture, might suffice to confirm DH. However, a European consensus statement among experts suggests that a 4–5 mm punch biopsy of the lesion should be taken regardless, particularly to address differential diagnoses [13] of other vesiculobullous disorders such as linear IgA disease, pemphigoid, eczema, and scabies [41].
Serum IgA-class antibodies against TG2, the autoantigen of CD, frequently circulate in undiagnosed patients with DH and should always be kept in mind in clinical practice [42]. IgA-class antibodies against TG3, the autoantigen of DH, are measurable in the serum of several patients with DH and a smaller percentage of those with CD [43]. However, the specificity of serum TG3 antibody assessment for DH and CD is currently unknown. As a consequence, TG3 antibodies are still reserved for research purposes only.
DH management is similar for children and adults. Ideally, treatment consists of a GFD with a resolution of cutaneous symptoms in 1–6 months in about 80% of patients [20]. Thus, if symptoms persist despite a strict GFD or there is only a reduction of the rush, dapsone (2 mg/kg/day or 4 mg/kg weekly) might be considered an add-on therapy [20,44].
As CD and DH are strictly embraced in suspected DH lesions, serological screening with IgA anti-transglutaminase, EMA and total IgA is necessary in order to establish both the DH and the CD diagnosis. IgA anti-transglutaminase evaluation is useful also for the monitoring of GFD adherence [13].

3. Psoriasis

Psoriasis is one of the most common chronic immune-mediated inflammatory disorders affecting approximately 2% of the global population [45,46]; one-third of cases occur in children [47] with a mean age of onset of 8 to 11 years [48,49].
Psoriatic skin lesions are characterized by erythematous scaly plaques tending to have a relapsing and remitting course. In childhood, the disease onset often occurs as a guttate form, evolving in plaque psoriasis in one-third of these patients [45]. Typical erythematous plaques with overlying white scales are often thinner and smaller than adults’ and tend to develop more often on the face and flexural areas, even if potentially present on the whole-body surface [50]. Many comorbidities, such as obesity, metabolic syndrome, arthritis, Crohn’s disease, uveitis, and diabetes, have been described in children with psoriasis [51].
The prevalence of CD in psoriatic adult patients is between 0.3 and 14.6% [52,53,54]. This wide percentage is mainly due to the diagnostic strategy considered to rule out CD, based only on antibody positivity or on duodenal histological evaluation. Two meta-analyses in an adult population showed that psoriatic patients were more than twice as likely to have a coexisting diagnosis of CD [55,56]. Conversely, it has been found that CD patients were approximately 1.8-fold more likely to have psoriasis [53], with a persisting risk even 5 years after CD diagnosis [57]. Some other studies did not find evidence of an association between psoriasis and CD markers, but these were small-size studies, and some lacked control groups [58,59,60,61].
Studies focused only on pediatric CD populations are scant. Thus, the prevalence of psoriasis in children with CD is currently uncertain. A study conducted in an adult population including children with CD also showed a positive association between these two diseases with a hazard ratio of 2.05 (CI 1.62–2.60) to develop psoriasis before and after CD diagnosis [57]. Other studies, including both children and adults, reported an increased association between CD and psoriasis [62,63]. A recent study of CD in adolescents demonstrated a consistent association with psoriatic skin disorder with a relative risk of 1.6 (CI 1.1–2.2) to develop this cutaneous disease [64]. In contrast, a recent retrospective study performed on 1925 pediatric patients with psoriasis did not find a significant association between CD and psoriasis [65]. Due to these scant data, the current pediatric psoriasis comorbidity guidelines do not support mandatory CD screening in all children with psoriasis [66].
Few studies have examined the role of the GFD in psoriasis manifestations leading to heterogeneous results. Studies evaluating patients with AGA (anti-gliadin antibodies) positivity, even without a defined CD diagnosis, reported a significant improvement in the PASI (psoriasis area and severity index) after a GFD compared to those with AGA negativity [67,68]. One study has assessed the effect of a GFD on psoriatic manifestations in patients with biopsy-proven CD, reporting a significant 6-months persistent improvement of the PASI in 9/10 patients after starting the GFD [69]. However, this improvement was not compared with the control group. A favorable role of a GFD was also reported in a case report [70].
To our knowledge, no studies have analyzed the role of the GFD exclusively in children with psoriasis. An isolated case report described a 5-year-old child with psoriasis and a subsequent diagnosis of CD, reporting only a slight improvement in the skin lesions after a GFD [71].
In summary, an active case finding with a shallow threshold to test should also be applied among psoriatic patients. In addition, the GFD may potentially be useful in psoriasis patients with a diagnosis of CD or with CD-specific antibodies positivity, but more well-conducted studies are needed.

4. Alopecia Areata

Alopecia areata (AA) is a patchy, nonscarring hair loss of the scalp that affects approximately 2% of the global population [72] and has a slightly higher prevalence in children and adolescents; 66% of patients with AA are younger than 30 years of age [73]. The sex distribution was approximately equal (M:F = 1:1.1). Diagnosis is clinical in all cases, based on a typical history of abrupt, patchy loss of hair, with or without progression, and a normal-looking scalp, without any secondary characteristics on examination (Figure 2) [73,74]. Psychological stress and anxiety have been reported to play an essential role in the precipitation and exacerbation of AA, and in contrast, AA is often a trigger for symptoms of depression and anxiety [75,76].
It has been estimated that approximately 7–14% of adult patients present more severe forms progressing to the total loss of scalp hair (alopecia totalis—AT), eventually associated with the loss of whole-body hair (alopecia universalis—AU) [77,78]. Childhood-onset is a negative prognostic factor as it is associated with a more severe disease with poor hair regrowth [73,79]. Nail’s alterations (pitting, striations, and brittleness) are also described in about 30% of patients [80].
The etiopathogenesis of AA is still unclear, even if an autoimmune T-cell-mediated reaction to the hair follicle has been recognized [81,82]. Other autoimmune disorders have been demonstrated in patients with AA, such as Addison’s disease, autoimmune thyroiditis, atrophic gastritis, systemic lupus erythematosus, rheumatoid arthritis, and vitiligo [81].
Studies performed in children on its association with CD demonstrated that a percentage from 0.7% to 2% of CD patients had AA, a percentage similar to that found in the general population [83,84]. Two studies carried out at the end of the 1990s on both adults and children with AA showed an estimated prevalence of biopsy-proven CD between 1:116 and 1:85, higher respect to the CD prevalence reported at that time in the general population (1:305), but in line with the actual disease prevalence [85,86]. One more recent study conducted on a small population (35 patients), considering only antibodies positivity without performing histological duodenal sampling, reported a prevalence of CD of 2.9% [87]. These data fail to fully demonstrate a higher risk of CD development in individuals with AA.
In CD patients, the role of the GFD in the improvement of AA lesions is controversial. Evidence is limited and mainly based on case reports or studies conducted with a small number of patients and without a control group. Considering a total of 31 patients, both adult and children, with concomitant CD and AA diagnosis reported in different studies, after the start of the GFD 70.9% presented hair regrowth (both partial and complete), 22.6% presented no regrowth, and 6.5% had no compliance with the diet [88]. In these patients, the response to the GFD has been assessed between 6–24 months, but most patients reported an improvement after a shorter time [85,86,89,90,91,92]. In one case series and one case report of patients with a CD diagnosis, a very limited effect of GFD in hair regrowth has been described, above all in those with more severe and extensive hair alterations (AT or AU) [91,92]. It should also be highlighted that AA lesions present a high rate of spontaneous remission [73], therefore the GFD role in hair regrowth should be confirmed in wider and well-conducted studies.
Concerning serological screening for CD in AA patients, according to the discussed data, it could be suggested in those patients with other risk factors or clinical/biochemical suspicion for CD.

5. Chronic Urticaria

Urticaria is a common systemic disease, occurring in 15–25% of individuals [93]. Clinically, we observe pink-to-red oedematous, itchy lesions that often have pale centers, can range in size from a few millimeters to several centimeters in diameter and are often transient, lasting for less than 48 h. Approximately 40% of patients with urticaria also experience angioedema [94]. Chronic urticaria (CU) occurs when the lesions occur for more than 6 weeks [95]. CU is often associated with significant morbidity and poor quality of life [96].
Hauteke et al. described the association between CD and CU for the first time, although the relationship between these two diseases is not fully clear [97]. Caminiti et al. performed a case–control study to determine the occurrence of CD in urticaria and matched control children. They found that CD was significantly more frequent in children with CU than in controls and that a GFD resulted in urticaria remission. Thus, CD may be regarded in such subjects as a cause of CU [98]. Ludvigsson and colleagues examined the association between CD and urticaria in the largest population-based cohort study involving 28,900 patients with biopsy-verified CD (both adults and children). They found a 1.5-fold increased risk of urticaria in CD, with a slightly higher risk for chronic urticaria (HR = 1.92). Furthermore, patients were at a moderately increased risk of receiving a diagnosis of urticaria or chronic urticaria before CD diagnosis [99].
The autoimmunity induced by gliadin or by other unknown antigens may link CU and CD. Levine A et al. proposed that the increased permeability of the intestinal mucosa allows the passage of antigens responsible for CU pathogenesis by the formation of circulating immunocomplexes [100]. Theoretically, this mechanism might cause urticarial lesions, so by restoring the integrity of the mucosa, a GFD might resolve them [101]. Furthermore, even though no meta-analysis is available, in some cases of CU, the adoption of a GFD has proven effective in controlling skin lesions in CD patients, further confirming that CU may be a cutaneous manifestation of CD and not a mere chance association [98,102]. Recently, Kolkhir et al. stated that CU is strongly linked with various autoimmune diseases, such as Hashimoto’s thyroiditis, pernicious anemia, vitiligo, diabetes mellitus type 1, Grave’s disease, and rheumatoid arthritis, and that it is essential to test children with chronic spontaneous urticaria (CSU) for other autoimmune diseases, including CD [103]. In addition, CD can be diagnosed in children with CSU even in the absence of other features; when starting a GFD, the decrease in the immunologic stimulus may account for symptom improvement in children with subclinical CD associated with CU [104]. Even though limited evidence is available, a practical recommendation to screen for CD in chronic unexplained urticaria sounds reasonable.

6. Atopic Dermatitis

Atopic dermatitis (AD) is a chronic inflammatory dermatosis that affects approximately 15–20% of children (Figure 3) [105,106]. It affects the pediatric population beginning in early childhood, and it may be subsequently associated with symptoms typical of other allergy diseases, such as food allergies [107]. Pediatricians generally manage AD, and it can affect children with a different degree of severity (the disease is mild in 76.4%) [108]. Most AD patients present a positive family history of atopic diseases, suggesting a genetic predisposition, and have food or aero-allergen sensitization [109].
Recent studies have demonstrated that AD patients are at risk of several autoimmune diseases [110]. In the literature, few studies have investigated the relationship between CD and AD in children, and the results are controversial.
The first study performed in a sample of 42 pediatric patients with CD found a higher prevalence of AD than that in a healthy pediatric population (45% vs. 25%, respectively) [111]. In contrast, Greco et al., in a sample of 83 patients affected by CD, showed that there was no increase in the rate of atopic diseases in CD patients compared to healthy pediatric controls [112]. Ress et al. showed a CD prevalence of 1.4% in a sample of 351 pediatric patients with AD with a four-times higher risk of being affected by CD (odds ratio 4.18; 95% confidence interval 1.1–15.7) [113].
Likewise, in one of the largest cohort studies (9290 adult and 10,196 pediatric AD patients), a statistically significantly higher risk of CD was not observed in children and adolescents with AD (OR 2.90, 95% CI 0.88–9.54) [104]. These data were not confirmed in the most recent study performed on 71,659 pediatric patients with AD in which atopic dermatitis was associated with a significantly higher prevalence of CD in the multivariate analysis (OR 1.609; 95% CI 1.42–1.82, p < 0.001) [114]. In the most recent retrospective study, it has been observed a significant association between AD and CD (OR 2.28; 95% CI 2.07–2.52). [115]. To our knowledge, no data are available on the efficacy of a GFD in controlling atopic lesions in patients with CD. Despite these uncertainties, active case findings should still be encouraged for children with AD showing+ other CD-related symptoms as well as in high-risk patients for CD.

7. Hereditary Angioneurotic Oedema

Hereditary angioneurotic oedema (HANE) is the most common genetically linked clinical disorder caused by a protein deficiency associated with complement activation. Hereditary angioedema due to C1-INH (HAE-C1-INH) deficiency is associated with enhanced consumption of early complement components, which may predispose patients to autoimmune disease. HANE is a life-threatening condition that manifests as oedematous attacks involving subcutaneous tissues and/or the upper airway/gastrointestinal mucosa. It usually presents in late childhood or adolescence in otherwise healthy subjects, and family history is present in approximately 75% of cases [116]. Farkas et al. described for the first time the occurrence of HANE in a child with CD. An 11-year-old male had a diagnosis of CD with remission of his clinical and histologic findings. Despite adherence to a GFD and a typical appearance of duodenal biopsies, she had a monthly attack of colicky abdominal pain, vomiting and diarrhoea from the age of 14 years; attacks were sometimes accompanied by subcutaneous oedema, and the abdominal US performed during an attack showed free peritoneal fluid. A novel missense mutation was detected in the C1-INH gene, and prophylaxis with tranexamic acid prevented the recurrence of symptoms [117]. Csuka et al. screened 22 pediatric CD patients with HANE. Four out of the 22 children were diagnosed with CD, with a higher prevalence of the latter disease among pediatric patients with hereditary angioedema (22 children) than in the general population (18.1% vs. 1.2%) [118].
Interestingly, introducing a GFD mitigated only abdominal symptoms of hereditary angioedema. The authors suggested that screening hereditary angioedema patients for CD is warranted if abdominal attacks or neurological symptoms persist despite adequate management. Likewise, complement testing is recommended whenever abdominal symptoms persist despite the histological and serological remission of gluten-sensitive features after introducing a GFD [118].

8. Other CD-Associated Skin Conditions

CD has also been demonstrated in the pediatric population to be associated with other skin disorders. This association has been described in some case reports lacking strict evidence and significant population analysis. The other CD-associated skin conditions are reported in Table 1.
Chronic allergic vasculitis was described in a 12-year-old girl with coeliac disease. A GFD induced remission of gastrointestinal and cutaneous symptoms [119], even if the effective pathogenetic link was not demonstrated.
Vitiligo is a pigmentary skin disorder that is more frequently associated with CD in children [82]. Lupus erythematosus is a worldwide chronic autoimmune disease that may affect every organ and tissue and frequently manifests with skin involvement. It has been associated with an increased frequency of CD diagnosis [120,121,122,123]. Both of these associations could be secondary to the autoimmune pathway shared by the reported diseases.
Behcet’s disease is a type of vasculitis presenting with chronic inflammation that affects multiple systems and vessels in young patients. Behcet’s disease and CD share many similar clinical and histological manifestations, and some case reports have shown a weak association between these two diseases [124].
Further CD-associated skin conditions are reported in Table 1.
About stomatous aphtosis, there are two pathogenetic hypotheses for these cases. The first is that stomatous aphtosis is directly influenced by gluten sensitivity, and the second is that dermatologic comorbidity is related to CD-untreated malabsorption [140,141].
Finally, CD could be associated with skin disorders due to malabsorption and deficiency of iron, folic acid, vitamin B12, zinc, vitamin A, vitamin PP, and other oligoelements.
Zinc deficiency may cause erythematous-squamous dermatitis in the periorificial regions, genitals and flexures; diffuse alopecia; and stomatitis [142].
Iron deficiency is associated with atrophic glossitis and angular stomatitis similar to vitamin B12 and folic acid deficiency [143].

9. Conclusions

Skin manifestations are frequently associated with CD in both adults and children. The role of GFDs is frequently crucial for the recovery of signs and symptoms associated with CD and for cutaneous manifestations as DH. GFDs might be beneficial also for some patients suffering from other skin disorders, which improve after gluten avoidance.
In contrast to adults, these associations are not entirely documented in children, and a great portion of the cutaneous manifestations are still uncertainly linked to CD.
According to this review, active case findings with CD screening should be encouraged in children with psoriasis. In patients with alopecia areata, chronic urticaria, atopic dermatitis, hereditary angioneurotic oedema, vitiligo, and other minor cutaneous disorders with limited evidence, CD screening should be reserved for children with other factors potentially relevant to CD suspicion.

Author Contributions

F.P., G.G. and G.D.N., conceptualized and designed the study, and approved the final manuscript as submitted. S.P., F.V., L.Z., A.M., V.D.C., P.P., C.Z., M.E. and G.Q. drafted the initial manuscript and approved the final manuscript as submitted. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Conflicts of Interest

The authors declare no conflict of interest..

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Nutrients 13 03611 g001 550
Figure 1. Dermatitis Herpetiformis. (A) Erythematous, papular, and vesiculosus lesions in a 14 year old child with Atopic Dermatitis and diagnosis of Celiac disease. (B,C) a magnification of the DH shows a typical polymorphism consisting of erythema, urticarial plaques, papules, grouped vesicles and blisters associated with intense itch and therefore followed by erosions, excoriations, and hyperpigmentation.
Figure 1. Dermatitis Herpetiformis. (A) Erythematous, papular, and vesiculosus lesions in a 14 year old child with Atopic Dermatitis and diagnosis of Celiac disease. (B,C) a magnification of the DH shows a typical polymorphism consisting of erythema, urticarial plaques, papules, grouped vesicles and blisters associated with intense itch and therefore followed by erosions, excoriations, and hyperpigmentation.
Nutrients 13 03611 g001
Nutrients 13 03611 g002 550
Figure 2. Alopecia Areata. (A) nonscarring hair loss in a 16 year old woman with onset diagnosis of Celiac Disease. (B) Dermoscopic image with a magnification 20×: dermoscopic features in alopecia areata are black dots (cadaverous hairs), yellow dots, tapering hairs (exclamation mark hairs), and broken hairs.
Figure 2. Alopecia Areata. (A) nonscarring hair loss in a 16 year old woman with onset diagnosis of Celiac Disease. (B) Dermoscopic image with a magnification 20×: dermoscopic features in alopecia areata are black dots (cadaverous hairs), yellow dots, tapering hairs (exclamation mark hairs), and broken hairs.
Nutrients 13 03611 g002
Nutrients 13 03611 g003 550
Figure 3. Atopic Dermatitis. (A,B) erythema, lichenification, scaling, and prurigo in a 6 years old child. Excoriated bilateral erythematous scaling papules and plaques on the surface of the lower limbs.
Figure 3. Atopic Dermatitis. (A,B) erythema, lichenification, scaling, and prurigo in a 6 years old child. Excoriated bilateral erythematous scaling papules and plaques on the surface of the lower limbs.
Nutrients 13 03611 g003
Table
Table 1. Other skin condition associated to CD.
Table 1. Other skin condition associated to CD.
Author (Year)Type of StudySkin Condition
Buderus, S. [125] (1997)
Molnár, K. [126] (2006)		Case reports
Case reports		Dermatomyositis
Abenavoli, L. [127] (2019);
Zone, J.J. [128] (2005)
Bartyik, K. [129] (2004)		Review
Review
Case report		Erythema nodosum
Vaz, S.O. [130] (2018)Case reportLinear IgA bullous dermatosis
Troncone, R. [131] (2014)Reviewpityriasis lichenoides
Nunnemann, S. [132] (2020)Case reportPorphyria
Nenna, R. [133] (2011)Case studyIchthyosis
Howard, G. [134] (2021)Case reportMorphea
Woolfson, H. [135] (1974)
Thelander, H.E. [136] (1946)		Case report
Case report		Erythroderma
Garcia, Y.H. [137] (2002)
Brinkert, F. [138] (2009)		Case Report
Case report		chronic mucocutaneous candidiasis
Müller, S. [139] (1999)Case reportlypodistrophia centrifugalis abdominalis infantilis
Yılmaz, S. [140] (2020)
Campisi, G. [141] (2008)		Case report
Observational study		Stomatous aphtosis
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Persechino, F.; Galli, G.; Persechino, S.; Valitutti, F.; Zenzeri, L.; Mauro, A.; Corleto, V.D.; Parisi, P.; Ziparo, C.; Evangelisti, M.; et al. Skin Manifestations and Coeliac Disease in Paediatric Population. Nutrients 2021, 13, 3611. https://doi.org/10.3390/nu13103611

AMA Style

Persechino F, Galli G, Persechino S, Valitutti F, Zenzeri L, Mauro A, Corleto VD, Parisi P, Ziparo C, Evangelisti M, et al. Skin Manifestations and Coeliac Disease in Paediatric Population. Nutrients. 2021; 13(10):3611. https://doi.org/10.3390/nu13103611

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Persechino, Flavia, Gloria Galli, Severino Persechino, Francesco Valitutti, Letizia Zenzeri, Angela Mauro, Vito Domenico Corleto, Pasquale Parisi, Chiara Ziparo, Melania Evangelisti, and et al. 2021. "Skin Manifestations and Coeliac Disease in Paediatric Population" Nutrients 13, no. 10: 3611. https://doi.org/10.3390/nu13103611

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