Bumps on your scalp can occur with trapped hair follicles or acne ... Pilar cysts are caused by keratin buildup in pockets of skin under your scalp. These cysts are not harmful to your health ...
This results in pustules, whiteheads, or other pimple-like bumps on the scalp that can be painful ... or reducing how much time your hair spends styled up or under a hat or helmet.