Erythema annulare centrifugum in a patient operated on for breast carcinoma.

A 73-year-old Caucasian female patient presented for three annular erythematous lesions on the left leg and buttock, persisting for two months, clinically interpreted as erythema annulare centrifugum. Routine laboratory findings were within the normal ranges, Borrelia serology and wet mount microscopy for mycosis were negative. Histologic examination confirmed the diagnosis of superficial erythema annulare centrifugum. Since no association of erythema annulare centrifugum with concomitant bacterial or viral infections, or active systemic disease was found in our patient, we considered the possible activation of her previous breast cancer operated on in October 2000.