Pyogenic granuloma-like acne lesions during isotretinoin therapy

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Abstract
Three male patients with severe nodulocystic acne were treated with oral isotretinoin in a dosage of 0.5-1.0 mg/kg per day. A flare of their disease developed, characterized by an inflammatory, hemorrhagic, pyogenic, granuloma-like response of previously crusted acne lesions. This reaction occurred between the 6th and 9th wk of treatment and was confined entirely to the chest and back. The severity of the reaction prompted the administration of oral prednisone and, in 2 cases, the discontinuation of isotretinoin therapy. In 1 patient, pyoderma gangrenosum developed on the thigh. The exact incidence of this pyogenic, granuloma-like reaction to isotretinoin is unknown, although it was seen in 3 of 66 patients with nodulocystic acne treated with this drug. The cause of the reaction is unknown, but it may be due to the increased skin fragility and vascular proliferation known to be induced by isotretinoin.

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