Acne is also known as acne, acne can be divided into four categories according to severity: 1, mild acne: blackheads, pimples, a small number or scattered distribution of red papules can be seen. 2, moderate acne: in addition to pimples, red inflammatory papules, can be seen superficial pustules, the number of rashes is increased compared to the mild acne, confined to the face. 3, severe acne can be seen in a large area of red inflammatory papules, and in some patients, can be diffusely distributed. It occurs on the face, neck, and chest and back.4. Severe acne, in addition to erythema, inflammatory papules and pustules, can be seen as cysts, and some of them may form scars, which may occur on the whole upper body.