types of acne. closed comedones, open comedones, inflamed acne, cysts. inflamed pimples. the structure of the skin. scar

acne anatomy bacteria bacterial beauty biology blackhead body care cell clear comedo comedone cosmetology dermatology dermis diagram disease epidermis face facial furuncle gland hair health healthy human illustration infection inflamed inflammation layer medical medicine papule physiology pimple pore problem pus pustule scar sebaceous sebum skin structure tissue treatment vector whiteheads