The main reasons for acne on the face are the following: 1, genetic characteristics: acne has the characteristics of family gathering, if the parents have acne during puberty, the chances of good offspring acne is high. 2, hormonal instability: unstable hormone levels in the body during puberty, resulting in acne, or irregular lifestyle and late night after adulthood, may also cause acne. 3, high skin oil secretion: cleaning is not in place , like to eat spicy, greasy food. 4, abnormal skin keratinization function: the formation of tiny micro acne, acne, etc. If you are accustomed to using powdered skin care products and do not have good cleaning and makeup removal habits, acne is also likely to occur. 5, infection by Acinetobacter or follicular worms: Infection by these pathogens is likely to induce an increase in acne.