Abstract
Lymphomatoid papulosis (LyP) is a rare CD30+ T-cell lymphoproliferative disorder. It classically presents as a chronic eruption of ulcerating erythematous papules on the trunk and extremities. While most cases are benign, 10-20% of patients may develop mycosis fungoides, anaplastic large cell lymphoma, and Hodgkin lymphoma. There are several histologic types of LyP; the three best-described are types A-C. Type A shows scattered atypical CD30+ T-cells among a diffuse inflammatory infiltrate of histiocytes, neutrophils and eosinophils.
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