Acne vulgaris occurs on lipid-prone areas of the face, often in the cheeks, front and sides of the nose, forehead and chin, and other areas with scattered corn to green bean-sized papules. Initially, the follicles are hyperkeratotic and plugged, and the sebum cannot be discharged and is retained in the follicles, resulting in localized elevation, which is known as “acne”. There are two types of acne: open (blackhead acne) and atretic (whitehead acne). Due to the inflammatory reaction and the action of microorganisms or follicular worms, acne can evolve into papules, pustules, cysts and scarring. 1. Pimple acne is a relatively mild type of acne that is dominated by pimples, which can be few in number or so many that they cover the face densely; 2. Papulopustular acne Common types. Medical pimples and inflammatory papules are the main types. The lesions are mainly inflammatory papules, small hard papules the size of a millet to a pea, light red to dark red. There may be blackheaded pimples or sebaceous plugs with unblackened tips in the center of the papules; 3. Cystic acne is common. Pustules are mainly follicular pustules, the size of a grain to a green bean. Pus is thicker after breaking and leaves shallow scarring after healing; 4. Nodular acne Deeper location, with pustular acne developing into thick-walled nodules of varying sizes, pale red or purplish red, with hemispherical or conical elevations; 5. Atrophic acne Papular or pustular damage destroys glands and causes pit-like atrophic scarring. Pustules that break down or naturally absorbed papules and pustules can cause fibrous degeneration and atrophy; 6, abscess acne Sebaceous cysts of varying sizes, often secondary to purulent infection, break down and bleed jelly-like pus. Inflammation is often not heavy, and later sinus tracts and scarring can be formed; 7. Convergent acne The most severe damage. The lesions are polymorphic and occur on the back, buttocks and chest. 8, malignant acne Millet to pea-sized greenish-red or purplish-red papules, pustules or nodules, containing pus and blood. Prisoners of debilitated patients. Pillsbury’s classification of acne: I degree (mild) acne predominant, a small number of papules, pustules, less than 30 total lesions; II degree (moderate) acne and a moderate amount of papules, pustules, 31-50 total lesions; III degree (severe) a large number of papules, pustules, 50-100 total lesions, less than 3 nodules; IV degree (severe clustered) nodular/cystic acne or aggregated Acne vulgaris, total lesions greater than 100, nodules/cysts greater than 3.