Erythema gyratum repens responding to cetirizine hydrochloride.

We report a case of erythema gyratum repens (EGR) in a 59-year-old man with inoperable pancreatic cancer and liver metastasis. The patient had a widespread erythema with concentric marginal band spreading in waves over the trunk and extremities. Numerous vesicles were seen on the margin of the erythema. The skin lesions were severely pruritic, and his peripheral blood showed marked eosinophilia. He also had palmoplantar hyperkeratosis. A biopsy specimen of the erythema disclosed spongiosis, microvesicles filled with eosinophils, infiltration of eosinophils into the epidermis, and a perivascular infiltrate in the dermis. The skin lesions and pruritus cleared quickly after the administration of cetirizine hydrochloride.