PMC7731695_01
Linear cutaneous lupus erythematosus with erythemato-violaceous and squamous papules and plaques with some atrophy along medial left knee.
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Atrophic, squamous, and erythemato-violaceous plaques following Blaschko's lines were noted on her left knee (Figure 1).
A hematoxylin eosin saffron-stained section at 100x magnification shows vacuolar interface dermatitis, lymphohistiocytic perivascular and periadnexal infiltrates and lymphocytic vasculitis. Collagen bundles are separated by a clear substance within deep dermis.
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Skin biopsy revealed vacuolar interface dermatitis with superficial and deep lymphohistiocytic perivascular and periadnexal infiltrates, lymphocytic vasculitis and increased dermal mucin deposition (Figure 2).
PMC7731695_02
Blaschkoid cutaneous lupus erythematosus: confluent squamous erythemato-violaceous papules with follicular plugging on left thigh.
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Blaschkoid squamous and erythemato-violaceous papules with follicular plugging were observed on his left anterior and medial thigh (Figure 3).
A hematoxylin eosin saffron-stained section at 100x magnification shows vacuolar interface dermatitis, lymphohistiocytic perivascular and periadnexal infiltrates, and lymphocytic vasculitis.
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Skin biopsy showed findings similar to the first patient (Figure 4).