There are three types of acne; Mild – You will see whiteheads and blackheads. Moderate – You will see whiteheads, blackheads, papules and pustules. (A papule is a small red bump, a pustule is a small bump on the skin that contain fluid or pus).
There are four main factors cause acne: Excess oil production, Hair follicles clogged by oil and dead skin cells, Bacteria, Excess activity of a type of hormone (androgens), Acne typically appears on your face, forehead, chest, upper back and shoulders because these areas of skin have the most oil (sebaceous) glands. Hair follicles are connected to oil glands.