Pimples

A pimple or zit is a kind of comedo that results from excess sebum and dead skin cells getting trapped in the pores of the skin. In its aggravated state, it may evolve into a pustule or papule.
Symptoms and Causes
* Pimples (pustules): Pus-filled bumps (papules).
* Papules: Small, discolored bumps, often red to purple or darker than your natural skin tone.
* Blackheads: Plugged pores with a black top.
* Whiteheads: Plugged pores with a white top.
* Nodules: Large lumps under your skin that are painful.