Small, red bumps (pimples or papules).
Whiteheads (closed comedones).
Blackheads (open comedones).
Small, pus-filled pimples (pustules).
Big, red pimples or pustules that feel tender.
More severe acne can cause:
An infected area that contains a collection of pus (abscess).
Hard, painful, fluid-filled sacs (cysts).
Scars.