1, the age distribution: the majority occurred at a young age (16 to 18 years old) before and after, but the incidence of early (for example, before and after the 10-year-old), and the incidence of late (such as after the age of 40).

2, clinical manifestations: There are two types of acne lesions: non-inflammatory lesions and inflammatory lesions. That is, non-inflammatory acne lesions. Acne based on whether there is open and is divided into blackhead (open comedo) and old age acne (closed comedo) two. There are a variety of inflammatory lesions performance: papules, pustules, cysts and nodules.

3, easy accur position: lesions occurred in cheek, forehead and nasolabial fold, followed by chest, back and shoulder.

Acne vulgaris (hereinafter referred to as acne), took place in the hair follicle is a sebaceous glands of chronic inflammatory skin diseases. In recognition of the disease there is a process, so understanding the disease process, given out between the disease are many different name. The most common alias: acne, barbed wine, such as acne.

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