When it comes to acne , nowhere on your body is safe — breakouts can appear on your scalp or hairline, felt, but not seen. As its name suggests, scalp acne consists of whiteheads and blemishes directly on the scalp caused by excess sebum, says board-certified dermatologist Dr. Steven Shapiro , founder of Shapiro MD hair care line . We interviewed dermatologists and hair experts about the best ways to treat and prevent scalp acne, including which ingredients to look out for and avoid, along with