Acne is certainly a disease, and it is the most common skin condition among young people. Acne is commonly known as pimples and strong bumps, and some young people jokingly refer to it as acne. Although acne sufferers can eat and drink and are healthy and strong, the fact that acne grows on the face and that young men and women love beauty makes acne a problem that should not be taken lightly. In fact, hundreds of young people are afflicted by this disease and struggle with it. The causes of acne are multifaceted. It is now recognized that the leading role is played by androgens (testosterone). During puberty, this hormone rockets upward, and androgen levels also rise relatively in young women. The sebum is stimulated by androgens causing high sebum production. At the same time, the sebaceous glands of hair follicles become keratinized and the channels for sebum excretion become narrower, so that more sebum, which cannot come out, accumulates in the sebaceous gland system of hair follicles. Of course, there are also many other predisposing factors, such as personal hygiene, skin type, lifestyle habits and systemic conditions, that play a role. The initial, most basic rash of acne is acne vulgaris. There are two types of acne: one is closed acne without a head, or white-headed acne, which looks like a yellowish-white dot or bumps of various sizes, buried in the skin with no opening and no head showing; the other is blackheaded acne, also called open acne. This type of pimple looks as if it is smaller and shallower, with an opening and a black dot —– black keratinized plug at the opening. It is whitish on the lower part, somewhat like a bean curd. Whiteheads are the predecessors of blackheads, but not few of them are “conservative” and do not “open” for life. From pimples, they can form or transform into papules, pustules, nodules, boils, and cysts, all accompanied by seborrhea. There are three types of sequelae of the above rashes: 1. Acne, non-infected papules, nodules and small superficial pustules that disappear without leaving a trace, or only punctate pigmentation and small temporary scars. 2.After the indiscriminate picking of pimples, indiscriminate squeezing of pustules and the elimination of originally larger pustules (including boils), they are mostly accompanied by hard scars of comparable size to boils or leave dense concave scars of pinhead size that never disappear, which are typical scars of acne. 3. Cysts and boils, especially those that break out, are large, deep and irregular stripes, cords or poke-shaped scars with a very hard texture that are extremely difficult to handle and surprisingly disfiguring in severe cases. All of the above are common acne. This type of acne occurs on the face (forehead, cheeks, and chin), shoulders, back, and front chest. There are usually no conscious symptoms or systemic symptoms, but there is pain when it becomes infected with pus.