[unseennude]

A 14-year-old female adolescent presents with a small red spot on her scalp. Her primary care physician advises her to use an antidandruff shampoo. Over the next 6 days, the lesion increases in size and becomes tender. The family notes that the lesion is crusted and occasionally oozes thick material.



The patient is systemically ill with a fever and poor appetite. Her primary care physician diagnoses a bacterial abscess of the scalp, institutes therapy with oral dicloxacillin, and requests a consultation with a surgeon for incision and drainage. What is the diagnosis?

Hint:The patient's parents are dairy farmers. Presently, the cows are experiencing an outbreak of a skin disease.