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 pressurized squeeze, see the head of the black and the body of the 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. The center of the papule may have a blackhead pimple or an apical undarkened sebaceous plug.

　　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 healed, leaving a tiny scar, and do not feel pain, infiltration is also very little. This type is often seen in weak patients.