Follicular lymphomatoid papulosis.

A case of follicular lymphomatoid papulosis (LyP) is reported. The patient was a 60-year-old Japanese woman. Clinically, cutaneous eruptions were reddish, centrally depressed, dome-shaped papules on the extensor aspect of the forearm. Histologically, they exhibited features that fulfilled the disease criteria described by Pierard, et al., i.e., (Am J Dermatopathol 1980;2:173-80), mixed cellular infiltrates including atypical Reed-Sternberg cell-like type-A cells and mycosis cell-like type-B cells surrounding hyperplastic follicular epithelia. The patient also showed many typical nonfollicular LyP papules, i.e., rhythmically recurrent papules which underwent spontaneous involution within a few weeks, over a 10-year period. The coincidental occurrence of a rare variant of follicular LyP and typical LyP in the same individual further suggests that follicular LyP is merely a histological pattern of LyP involving epithelial adnexae.