A 3-year-old boy presented with an 8 week history of inflammatory nodular lesions on the scalp. Shortly afterwards painful subcutaneous nodules developed on the lower legs. Epidermophyton floccosum was isolated from the scalp lesions and a diagnosis of erythema nodosum induced by kerion celsi of the scalp was made. The patient was started on oral therapy with 250 mg/day griseolfuvin, associated with topical eosine and myconazol. Erythema nodosum represents a reaction pattern to a wide variety of inflammatory stimuli. The interest of this case lies in the unusual association of kerion celsi and erythema nodosum and in the identification of Epidermophyton floccosum in the lesions of the scalp.