A face full of acne is generally a manifestation of acne. There are many causes of acne, including the following: 1, endocrine disorders: If you are in adolescence, the body androgen activity increases, the body hormone level imbalance, easy to trigger the sebaceous glands secretion. Irregular habits, such as staying up late for a long time, will also lead to an imbalance in the body’s endocrine secretion, increasing the risk of acne on the face; 2, pore blockage: excessive use of skin care products or cosmetics, poor cleaning can easily lead to cosmetic residues, as well as a variety of dust and dirt accumulation, accelerating the hair follicle mouth keratinization, clogging the pores, ultimately causing acne all over the face; 3, bacterial infection: improper facial cleaning also easily lead to hair follicles within the Bacteria, such as Propionibacterium acnes and other overgrowth, will accelerate the formation of inflammation of the hair follicles, resulting in acne on the face; 4. Bad eating habits such as excessive consumption of sweet and greasy food can also trigger acne all over the face. Patients with severe acne can choose medication, photodynamic therapy, laser treatment and other treatment options to improve their skin condition according to their situation. Paying attention to skin cleanliness in daily life, maintaining a diet with less oil and sugar, and exercising in moderation can reduce the formation of acne.