Acne is a skin condition that occurs when your hair follicles become plugged with oil and dead skin cells. It causes whiteheads, blackheads or pimples. Acne is most common among teenagers, though it affects people of all ages. Effective acne treatments are available, but acne can be persistent. Certain things may trigger or worsen acne: Hormonal changes. ... Certain medications. ... Diet. ... Stress. Here are few tips to control your acne: Properly wash your face. To help prevent pimples, it's important to remove excess oil, dirt, and sweat daily. ... Know your skin type. ... Use a moisturizer. ... Use over-the-counter acne treatments. ... Stay hydrated. ... Limit makeup. ... Try not to touch your face. ... Limit sun exposure.