Acne by the ear may be related to folliculitis, sebaceous cysts and acne. 1. Folliculitis: It is commonly caused by the intake of spicy and irritating diet, irregular work and rest, staying up late, irritability, tension and anxiety, which leads to decreased immune function. Bacteria in the hair follicles next to the ears multiply and cause folliculitis. 2. Sebaceous cysts: The sebaceous gland excretory ducts are blocked, and the sebaceous gland secretions in the sebaceous gland epithelium become more and more numerous until the contents gradually swell, leading to the formation of cysts. They can grow on the side of the ear or on other parts of the skin. 3. Acne: Related to irregular diet and lack of local cleansing. Mostly occurs in adolescence due to more androgen secretion, sebaceous gland synthesis and excretion of sebum increased, as well as keratinization of hair follicles, bacterial proliferation caused by the blockage of the pores will form acne. If you have pimples on the side of your ears, it is recommended that you seek medical attention in a timely manner, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and actively cooperate with the doctor to deal with or treat the problem.