Acne around the ears may be related to endocrine factors, abnormal keratinization of follicular sebaceous gland ducts, dietary factors and other reasons. 1. Endocrine factors: androgens can increase the size of sebaceous glands and sebum secretion, so if androgens are at a high level, acne around the ears may occur. 2. Abnormal keratinization of follicular sebaceous gland ducts: this can lead to narrowing or blockage of the duct opening, thus affecting the normal discharge of epithelial cells and sebum shed from the follicle wall and the formation of acne. 3. Dietary factors: such as fat, sugar, cocoa, etc. can increase the production of sebum, prone to acne. It is recommended that people with acne on the side of the ear go to the hospital in time to clarify the cause, and if treatment is needed, it should be standardized under the guidance of the doctor.