A pimple inside the ear that hurts when you touch it may be caused by sebaceous cysts with infection, boils or folliculitis in the external ear canal. 1. Sebaceous cyst with infection: usually due to long-term lack of attention to ear hygiene, resulting in sebaceous gland ducts blocked, resulting in sebaceous glands in the secretion can not be discharged normally, and then the formation of sebaceous gland cysts, resulting in the growth of a pimple in the ear, when combined with the infection, the pimple in the ear when touched pain, but also accompanied by pus, redness and swelling and other symptoms. 2. External auditory canal boil: usually due to acute purulent inflammation of the follicles and surrounding tissues of the local skin of the external auditory canal, often induced by Staphylococcus aureus, clinically known as external auditory canal boils, resulting in a pimple inside the ear that hurts when touched, and may be accompanied by itching in the ear, pus and other symptoms. 3. Folliculitis: a purulent inflammation confined to the mouth of the hair follicle. The lesions begin as red follicular papules, pustules appear in the center within a few days, surrounded by a red halo, the pustules dry up or rupture after the formation of yellow scabs, scabs fall off generally do not leave a scar. Occurs in the external auditory canal can be found when a pimple grows a touch hurts. A pimple inside the ear hurts when touched, may also be related to other factors, if the symptoms continue to get no better, it is recommended to seek medical attention as soon as possible, after clarifying the causative factors, by the doctor’s guidance for treatment.