What is the total length of closed acne on the face

The total length of the face is closed acne, which may be considered acne, a chronic inflammatory skin disease of pilosebaceous gland units, while closed acne is one of the non-inflammatory skin lesions of acne, because its skin lesions are about 1 mm-sized skin pimples without obvious hair follicle openings, so it is also called white head. The reasons for showing closed acne are considered to be related to excessive sebaceous gland secretion, blockage of hair follicle sebaceous gland ducts, bacterial infection and inflammatory reaction, incomplete facial cleaning, poor living habits and eating habits, etc.