Pilonidal cyst of the scalp.
D000293:Adolescent; D000505:Alopecia / Q000209:etiology; D002675:Child, Preschool; D006259:Craniocerebral Trauma / Q000150:complications; D006801:Humans; D008297:Male; D010864:Pilonidal Sinus / Q000209:etiology / Q000601:surgery*; D012535:Scalp / Q000601:surgery*