PMC8565706_01
Dermatomyositis. Perivascular lymphocytic infiltrate (black arrows) and dermal edema with mucus (blue arrow) (HE, x100)
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Shave biopsy of a proximal arm skin lesion revealed interface dermatitis with a sparse perivascular lymphocytic infiltrate with edema and mucin in the dermis concerning for dermatomyositis (Figure 1).