PMC5294753_01
A 66-year-old white woman with multiple asymptomatic, reddish brown, ovoid thin plaques following skin tension lines on the back resembling pityriasis rosea.
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fig1
These lesions involved the upper back, chest, abdomen, neck, and axilla but spared the face and lower extremities (Figs 1 and 2).
Three nonconfluent linear-to-ovoid, reddish brown, thin plaques without scale in the right axilla.
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These lesions involved the upper back, chest, abdomen, neck, and axilla but spared the face and lower extremities (Figs 1 and 2).
A, Skin biopsy section shows brisk superficial, deep, and periadnexal inflammatory infiltrate of plasma cells and occasional lymphocytes. B, Plasma cells. C, lambda in situ hybridization. D, kappa in situ hybridization. Cells stained positive for kappa light chains and lambda light chains. (Hematoxylin-eosin stain; original magnifications: A, x4; B, x10; C and D, x20.)
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Histopathologic examination found brisk papillary and mid-dermal perivascular and periadnexal inflammatory infiltrate of plasma cells and occasional lymphocytes (Fig 3).