Whiteheads, blackheads and other types of acne occur when skin glands become plugged with oil and bacteria. They commonly appear on the face, chest, upper neck and back. Contrary to what many people think, chocolate, greasy foods and dirt are usually not to blame for acne. However, hormones, which can affect skin glands, are a major contributor. Other hormonal influences include pregnancy and menopause.
Some experts blame chronic stress because that increases levels of certain hormones.
These treatments work by preventing new acne. So, it may be a month or two before you notice an improvement. These agents also may cause skin irritations. Choose a gentle cleanser and avoid rough scrubs or pads. Don't squeeze, pick or pinch blemishes, which can cause scarring and possibly more acne.