Fluid or pus: Infections may cause bumps to ooze or become filled ... trigger this condition," says the expert. It is cyst-like lesions on the scalp caused by clogged pores, and are painful.

Numerous things can cause scalp acne, says Dr ... acne on your scalp can appear as comedones, papules, or cysts along the hairline and scalp," adds Dr. Teymour. "The key difference is that ...