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a chronic papular and ulcerative variant of pityriasis lichenoides et varioliformis acuta characterized by dermal perivascular infiltration by atypical T lymphocytes suggestive of a lymphoma; it is usually benign, but transformation to lymphoma has been reported.
lymphomatoid papulosisA roccidig papular eruption of the skin that histologically resembles lymphoma; although most lesions behave in an indolent fashion, gene rearrangement studies demonstrate a T-cell clonal expansion (10–20% evolve to T-cell lymphoma); acral and truncal distribution.
Arthropods, infectious granulomas (TB, fungal), leukocytoclastic vasculitis, PLEVA (pityriasis lichenoides et variolis acuta), pseudolymphoma, scabies.
Langerhans cell histiocytosis.
Acute lymphoblastic lymphoma, Merkel cell carcinoma, mycosis fungoides.