What Is Acne?
Acne and pimples are spots that become visible on the face, neck, chest, back and other areas of the body. Acne appears when the pores of the skin get blocked. When the pores collapse and trap sebum — the oily secretion of the sebaceous glands — dead skin cells and bacteria build up, leading to blackheads, whiteheads and inflamed pimples.
No one knows exactly why acne develops, but hormones, diet, stress, genetics and lack of vitamins all play a role. The good news is that a wide range of effective treatments and medicines are available to help you manage and clear acne.
Types of Acne Conditions
- Blackheads — open comedones that appear as small dark spots on the skin.
- Whiteheads — closed comedones that form when a pore is completely blocked.
- Papules and pustules — inflamed, red bumps and pimples.
- Nodules and cysts — deep, painful lesions that can cause scarring.

Learn more about the different types of acne and the main causes of acne.