Derm Dx: Diffuse nodularity of the scalp

The patient is a 25-year-old black male who seeks medical consultation for a scalp disorder. The condition is of approximately 18 months in duration and is at times painful. He has received treatment at two clinics, consisting of drainage and oral antibiotics with minimal improvement. Examination reveals diffuse nodularity of his scalp, with scarring alopecia. Palpation at several sites elicits ...