Methotrexate-induced cutaneous ulceration is a rare but potentially serious drug adverse reaction. This adverse reaction of methotrexate therapy has been initially described in psoriasis patients and is unusual in patients with cutaneous T-cell lymphoma. In 1978, Mc Donald et al reported the first three cases of cutaneous ulcerations in patients treated for a mycosis fungoides with intravenous infusions of methotrexate . Since then, few cases of methotrexate-induced skin ulcers in patients with mycosis fungoides have been published [2-5]. We report an additional patient with erythrodermic mycosis fungoides who developed cutaneous ulcerations as a sole manifestation of methotrexate toxicity.