grannymed.com — Acne is not a serious health threat but, it can cause scars. There are many types of pimples such as: Whiteheads (stay under the surface of the skin), Blackheads (rise to the skin's surface and look black), Papules (small pink bumps), Pustules (red with pus on top), Nodules (large, painful, deep in the skin), Cysts (deep, painful, can cause scars).