The dictionary defines acne as: "an inflammatory disease of the sebaceous glands, characterized by comedones and pimples, esp. on the face, back, and chest, and, in severe cases, by cysts and nodules resulting in scarring."
There are more pilosebaceous units on the face, neck, chest, and back, so that's where more pimples and blackheads develop.
It's estimated that about 85% of all teenagers will have acne to some degree. Most of them will simply outgrow acne by the time they are in their early 20s.
There are treatments today for teenage acne that can help keep the acne under control. It's very important to keep their faces clean. Bar soaps or washes may be used and vary from 2 to 10% in strength.
Wash your face with your fingers using a gentle circular motion. Clean your face at least twice each day, morning and evening, and if you are having an outbreak, increase cleansing to three or even four times a day.
NOT consuming certain foods (nutrients) can contribute to acne. Vitamins A, E, and B6 are the biggies, but there are also many other trace elements that the body and the average American diet does not include enough of these vitamins, minerals, and trace elements.
Zinc is important to help maintain healthy skin, as well. it is difficult to get enough zinc in the most balanced of diets, it is usually recommended that a zinc supplement be taken by mouth.
It is widely accepted as fact that one the most important factors in fighting acne is complete and correct facial cleansing twice daily, along with good balanced diets.