Abstract
A patient with generalized granuloma annulare experienced resolution of her lesions after 6 mo. of treatment with 1500 mg/day of niacinamide. Niacinamide seems to be a reasonably safe drug that, even at relatively high doses, is associated with a low incidence of side effects. The participation of a delayed hypersensitivity reaction in the pathogenesis of granuloma annulare and possible mechanisms involving niacinamide in this type of reaction are discussed.