Abstract
Conflict of interest: none declared. Mycosis fungoides (MF) is the most common form of cutaneous T‐cell lymphoma. Early MF presents as erythematous patches or plaques without internal involvement. Narrowband ultraviolet B (NB‐UVB) phototherapy is effective for early‐stage MF, and carries a low risk of adverse events. We present a unique case of lentigines confined to the site of resolved MF plaques after NB‐UVB phototherapy. A 49‐year‐old Chinese man (Fitzpatrick phototype III) presented with a 1‐year history of recurrent itchy erythematous patches and plaques. Physical examination revealed erythematous plaques on the flexor areas of the right thigh, and erythematous patches on both arms (Fig. 1a). Histological examination of a biopsy taken from the plaque found intraepidermal Pautrier microabscesses and an intense infiltrate of mononuclear cells containing atypical lymphocytes in the upper dermis (Fig. 2a). Immunohistochemistry showed that most of the infiltrating cells were CD3 and CD4 positive. Results of blood cell count, blood biochemistry and CD4/CD8 flow cytometry were normal.
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