Acne and blemishes are common skin concerns that occur when hair follicles become clogged with oil, dead skin cells, and bacteria. This can lead to various types of spots, including pimples, blackheads, whiteheads, and cysts. Acne often appears on the face, chest, back, and shoulders and can range from mild to severe. Blemishes, which are the marks left behind after breakouts, can include dark spots, redness, or scarring, which may linger even after acne has cleared.