A pimple is a small pustule or papule. Pimples develop when sebaceous glands, or oil glands, become clogged and infected, leading to swollen, red lesions filled with pus. Also known as spots or zits, pimples are a part of acne. They are most likely to occur around puberty, but they can happen at any age. Pimples most often affect the face, back, chest, and shoulders. This is because there are many sebaceous glands in these areas of skin. Here are some key points about pimples. More detail is in the main article.
Pimples range in severity, from blackheads to cysts.