Acne is a skin condition that occurs when the oil glands of your skin become plugged. More than 90% of teenagers have some acne. With acne you will have blackheads, whiteheads (pimples), or red bumps on your face, neck, and shoulders.
Large red bumps mean the infection has spread beyond the oil gland. If you have several red bumps, you probably also need an antibiotic. Antibiotics come as solutions for the skin or as pills.