Pimples under the ears generally refers to acne, which may be caused by physiological reasons, such as bad habits, improper cleaning; it may also be caused by pathological reasons, such as endocrine disorders, inflammatory reactions and so on. 1. Physiological causes: (1) Bad life habits: it may be that the sebaceous glands next to the ears are secreting vigorously due to bad dietary and living habits, such as eating too much spicy and greasy food, and too much sweet food, which can lead to acne under the ears of the patients. (2) Improper cleaning: patients with symptoms of acne under the ear, may be related to improper skin cleaning, because the sebum secretion under the ear is more, not timely cleaning can lead to acne, local pimples, pimples and other symptoms. 2. Pathologic causes: (1) endocrine disorders: it may be caused by endocrine disorders, if you stay up late and sleep late for a long time, mental stress, etc., it will lead to hormone level imbalance in the body, which can lead to sebaceous glands to secrete a large amount of sebum, and acne will appear. (2) Inflammatory reaction: Infections such as Propionibacterium acnes on the face can lead to localized inflammatory reactions, causing red papules and pustules. Patients with acne are advised to go to the dermatology department of the hospital and follow the doctor’s instructions for treatment.