a pore in your skin gets clogged, usually with dead skin cells. Sometimes bacteria get trapped inside the pore, too, causing the area to become red and swollen.
Cystic acne happens when this infection goes deep into your skin, creating a red, tender bump that’s full of pus. It may hurt or itch. If a cyst bursts, the infection can spread, causing more breakouts.
Acne vulgaris is the medical name for common acne – the presence of blackheads, whiteheads, and other types of pimples on the skin. The most common spots for breakouts are the face, chest, shoulders, and back. Although mild acne may improve with over-the-counter treatments, more severe forms should be treated by a dermatologist.