Kerion: A boggy Lump on the scalp of an adolescent
The present case has been reported in the journal NEJM. A 13-year-old girl presented with a slowly enlarging, painful swelling of the scalp that had first been noticed 3 weeks earlier. She had received several courses of empirical oral antibiotics for suspected bacterial folliculitis and cellulitis, without improvement.

On examination, there was an erythematous, mildly tender, boggy swelling overlying her occiput (Panel A). The lesion was studded with pustules and had associated serosanguineous discharge and alopecia.

A sample from the involved area was obtained, and a 10% potassium hydroxide preparation revealed fungal hyphae and confirmed the diagnosis of a kerion.

A kerion is an inflammatory, dermatophytic, fungal infection of the scalp that is usually seen in children. It is characterized by a suppurative, tender swelling that is often associated with regional lymphadenopathy and can be mistaken for bacterial folliculitis.

Kerion is most commonly caused by the zoophilic dermatophytes Trichophyton verrucosum and Trichophyton mentagrophytes. Treatment with oral griseofulvin is often used, although other antifungal agents may also be effective.

A delay in diagnosis and treatment can result in scarring alopecia. This patient was treated with griseofulvin for 6 weeks and showed marked improvement, with regression of the lesion.

Source: https://www.nejm.org/doi/full/10.1056/NEJMicm1514152
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