Acne is a common age-related disease. Acne mainly affects people as they get older (up to 25 years of age) but in some cases it can last for many years. Ninety percent of teens are infected. Acne mainly affects the hair follicles and the adjacent sebaceous glands. The primary cause of acne is comedones , which are of two types. The shallow comedones of these are seen as black from the outside , called blackheads. The deep comedones can be seen white from the outside. That's why he is called Whitehead. In addition, there may be small grains , large grains , grains with pus. Acne mainly affects the face , neck , chest , back and upper arm. Cause: The exact cause of acne has not been determined yet. However, the facial defects of the hair follicles and the oil glands attached to them , the excess of the hormone called androgen in adolescence. Acne can be caused by a type of bacterium called P-acne. Acne can also be caused by heredity. Acne does not occur in normal thinking. However, under extreme stress , a type of secretion called androgen from the body increases and causes acne. Acne mainly affects men in middle age with excessive use of cosmetics. Acne mainly affects middle-aged women due to excessive use of cosmetics , birth control pills and menstrual irregularities. Acne mainly affects people in the early stages of puberty. Treatment: Acne is being treated in many ways at present. No one particular drug is good for all patients. It is better for every patient to take treatment according to his skin type , type of acne , cause of acne. Vitamin A creams applied to the affected area are generally tolerant and good.