8Cutaneous lupus erythematosus: Diagnosis and treatment
Introduction
The auto-immune disease lupus erythematosus (LE) is associated with a broad range of cutaneous pathology. Cutaneous manifestations are frequently the presenting sign of LE, and in the case of certain cutaneous LE (CLE) sub-types, they can occur in the absence of systemic disease. CLE is two to three times more frequent than systemic lupus erythematosus (SLE) [1]. Similar to proposed aetiologies for SLE, current theories discuss a multifactorial relationship leading to the development of cutaneous lupus, including genetic susceptibility, auto-immune induction and immune-system damage.
Section snippets
How is CLE currently classified?
At present, dermatologists use the only universally accepted criteria for the classification of SLE, which was set forth by the American College of Rheumatology (ACR). This scheme of 11 clinical and lab criteria was developed by rheumatologists for the purpose of distinguishing SLE from other auto-immune diseases. The ACR guidelines require four of 11 criteria to be met for a diagnosis of SLE; however, four of the criteria are cutaneous in nature (malar rash, discoid lesions, mucosal ulcers and
Acute cutaneous lupus erythematosus
ACLE typically presents in the third decade of life and is frequently associated with active SLE [9], [10]. There are localised and generalised forms of ACLE. The localised form is the frequently described malar, or ‘butterfly’ rash, which refers to erythema that occurs over both cheeks, extends over the nasal bridge and spares the nasolabial folds [11]. These lesions are classically transient, sun-induced and non-scarring, although dyspigmentation can occur [12]. Patients may initially mistake
How can we properly diagnose CLE?
In order to properly diagnose cutaneous manifestations of LE, the physician must first correctly classify the sub-type and exclude systemic involvement of the disease. As discussed earlier, diagnosis based solely on ACR criteria should be avoided, as the ACR criteria were designed to distinguish between the various auto-immune diseases. Rather, CLE diagnosis should be based on the findings of patient history, clinical examination, laboratory studies, serology as well as histology and DIF
Prevention
In treating CLE, dermatologists aim at preventing the formation and progression of lesions and improving skin appearance through a combination of patient education and topical and systemic therapies (Fig. 4). Patient education on heat, sun and drug avoidance is standard. Patients should be advised to avoid manipulation of lesions, as this can induce new lesions [12]. Makeup products such as Dermablend or Covermark should be offered to camouflage lesions. Strict sunscreen adherence is a critical
Summary
CLE comprises a range of dermatologic manifestations, including ACLE, SCLE and CCLE. The ACR criteria, which include four cutaneous signs, may lead to overdiagnosis of SLE in patients with predominantly cutaneous disease. The diagnosis of CLE requires proper classification of the sub-type, which is best accomplished by a focus on the clinical and histologic findings. Serology and DIF are less helpful in making the diagnosis. CLE treatment combines sun protection, topical therapies and systemic
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