Association of the Spectrum of Cutaneous Lupus Erythematosus with Disease Activity and Systemic Manifestations in Patients with Systemic Lupus Erythematosus.

Background: Cutaneous involvement is common in systemic lupus erythematosus (SLE) patients and may be essential to the disease activity. This study aimed to describe cutaneous manifestations spectrum and determine the association of cutaneous lesions with the disease activity and systemic involvement among SLE patients in Malang, Indonesia.

Methods: A cross-sectional study was conducted using 54 SLE patients from rheumatology outpatient clinic at Saiful Anwar General Hospital Malang, Indonesia. Cutaneous features were classified according to Gilliam and Sontheimer classification of cutaneous lupus. Disease activity and clinical manifestations were documented according to Mexican-SLE disease activity index (Mex-SLEDAI).

Results: Among 54 subjects, 50% of the patients had cutaneous manifestations. Subacute cutaneous lupus erythematosus (SCLE) was observed in 11.1% of patients, and malar rash in 20.4%. Subjects with cutaneous lesions had significantly higher Mex-SLEDAI scores, especially those who had SCLE (p<0.001), malar rash (p=0.002), alopecia (p=0.002), and photosensitivity (p=0.032). Six patients (11.1%) had skin infections with higher disease activity (9[8-11]vs.2[0-4];p<0.001). SCLE was significantly associated with malar rash (OR 11.7[1.8-76.5]), vasculitis (OR 43.0[4.1-445.6]), and fatigue (OR 15.0[2.1-108.8]). Malar rash was associated with photosensitivity (OR 8.4[1.6-44.0]), while oral or nasal ulcer was associated with fatigue (OR 8.6 [1.4-54.6]). Vasculitis (OR 5.9[1.0-35.1]) and nephritis (OR 11.7 [1.8-76.5]) were associated with the presence of skin infection.

Conclusion: SCLE and malar rash are the most common cutaneous lesions among subjects. Subjects with cutaneous lesions have relatively higher disease activity. Several skin lesions are also associated with SLE patients' systemic manifestations.