This is actually my multiple Pilar cyst scalp patient. This was a Pilar (trichilemmal) cyst. They are derived from the outer root sheath of the hair follicle. They are most commonly found on the scalp but can be anywhere on the body, like this one on the back.
Mustard Ball cyst. Pilar cyst on the back. Yellow mustard pop. Cyst excision and closure. MrPopZit 2012
