When combined with sweat, dead skin cells, and other debris, the buildup can cause flaking and make the hair look greasy. If left untreated, the buildup of sebum on the scalp can lead to dandruff, ...
The flakes look like dandruff, but, unlike dandruff ... larger acne nodules and cysts that are deeper in the skin and can be very painful. Acne on the scalp is often caused by an increase in sebum, ...