Poikilodermatous and verrucous mycosis fungoides

Summary Mycosis fungoides (MF) is a cutaneous lymphoma of presumed T‐helper cell origin. It usually presents with patches and infiltrated plaques, but a wide range of atypical forms have also been described. We report a 48‐year‐old man who had a 2‐year history of a pruritic, warty plaque on the right palm with surrounding poikilodermatous changes. He subsequently developed additional macules of poikiloderma atrophicans vascuiare (PAV) on the right upper limb and abdomen. Biopsies from the arm showed poikilodermatous changes, and the warty plaque had features of MF. Verrucous or hyperkeratotic lesions appear to be an uncommon presenting feature of MF with few case reports in the literature to date. This presentation may be associated with considerable diagnostic delay, and MF should be considered in the differential diagnosis of acquired verrucous lesions. This case also illustrates that PAV may herald cutaneous malignancy, and that patients with this condition require close follow up.