Biopsy specimens from SPP patient SF illustrating the diagnostic criteria compact stratum corneum with moderate acanthosis and foci of spongiosis, slightly edematous papillary dermis with a sparse band-like infiltrate composed of bland lymphohistiocytic cells, few of them epidermotropic lymphocytes, and absence of so-called Pautrier’s microabscesses. (A) Hematoxyline-eosine staining (×33); (B) CD3 staining (×50) showing the T-cell nature of the infiltrating lymphocytes.