Pimples under the ears are considered to be folliculitis, epidermal cysts, sebaceous cysts and so on. 1. Folliculitis: Folliculitis is an inflammation that occurs in the hair follicle area and is related to bacterial infections, such as Staphylococcus aureus, gram-negative bacteria, and also combined with fungal infections, leading to fungal folliculitis. Bacterial and fungal involvement in the hair follicle causes inflammation in the hair follicle area, which is manifested as pimples and papules. 2. Epidermoid cyst: it is a kind of cyst containing keratin in the dermis of the skin, which may be primary or originated from the destruction of the hair follicle structure, and it can occur in any part of the human body, and it is more common in the head, face and trunk, with smooth surface of the skin of the cyst, and normal skin color or light brown. 3. Sebaceous cysts: Sebaceous cysts are cysts formed by the gradual siltation of sebum, and the sebaceous gland ducts in the skin have a relationship with the blockage of sebaceous glands, which will lead to the gradual siltation of sebum to form a retention cysts, commonly found on the head, face, back, etc., can also be manifested as pimples under the ears. Acne under the ears may also have other causes, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.