Periungual telangiectasia may ulcerate. Histopathologic criteria include, epidermal atrophy, follicular hyperkeratosis, thickened basement membrane, vacuolar interface dermatitis, pigmentary incontinence and perivascular mononuclear inflammation. Subacute lupus features identical laboratory findings associated with a light sensitive, polycyclic marginal erythema . Discoid Lupus Erythematosus. The cause is unknown, but the condition is aggravated or induced by sun.
Spontaneous cure occurs, often without scars.
However, in the scalp the patches usually leave scars that destroy the hair and look like pseudopelade. The erythrocyte sedimentation rate is usually elevated, and there may be leukopenia. Treatment Local Treatment. Intracutaneous triamcinolone acetonide injection may lead to rapid and lasting control, although monthly retreatment is often necessary. Avoiding the sun with opaque blocks is essential.