Erythema nodosum induced by kerion celsi of the scalp

A 5-year-old girl presented with a 2-week history of a sharply demarcated, inflammatory, granulomatous lesion on the right side of her scalp. Shortly afterward, painful, subcutaneous nodules developed on her shins and thighs. Trichophyton mentagrophytes was isolated from the scalp lesion and a diagn osis of erythema nodosum induced by kerion of the scalp was made. The patie nt was started on oral therapy with 18 mg/kg/day griseofulvin, associated w ith topical crystal violet. Her erythema nodosum regressed in 10 days, whil e the kerion healed 6 weeks later, leaving residual scarring alopecia, Eryt hema nodosum represents a reaction pattern to a wide variety of inflammator y stimuli. The interest of this case lies in the unusual association of ker ion erythema nodosum, of which only nine cases have been reported in the in ternational literature.