1, blackheads are the main damage of acne, is stuffed in the follicle sebaceous gland mouth of the cheese-like semi-solid, exposed in the follicle mouth of the outer end of the black, such as pressure to squeeze, the head is seen to be black and the body of the body was a yellowish-white semi-transparent sebaceous plugs discharged.

　　2, skin lesions to inflammatory pimples mainly, millet to pea-sized hard pimples, light red to dark red. In the centre of the papule there may be a blackhead or a sebaceous plug with an undarkened tip.

　　3, the damage is millet to broad bean size greenish-red or purple-red papules, pustules or nodules, light and soft, and contains pus and blood, they do not heal for a long time, and later healing left tiny scar, and do not feel pain, infiltration is also very little. This type is most common in patients who are physically weak.