This patient has an epidermoid cyst which has recently become inflamed and "infected". I put "infected" in quotes, because technically this is not an infection: When an epidermoid cyst ruptures, it creates a vigorous foreign body inflammatory response - this skin becomes warm, tender, painful, and swells, simulating an abscess. Incision and Drainage (I & D), will confirm the diagnosis of inflamed cyst, when the cheesy, sometimes odiferous material is evacuated, and this process often leads to rapid resolution of symptoms. These episodes are often misdiagnosed as "infection" of the cyst, but cultures are usually negative and antibiotic treatments is not required. Intralesional steroids can hasten the resolution of symptoms as well.

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This video may contain dermatologic surgical and/or procedural content. The content seen in this video is provided only for medical education purposes and is not intended to be a substitute for professional medical advice, diagnosis, or treatment.