A pain inside the ear and a bag may be caused by an external ear canal boil, sebaceous cyst secondary infection, and folliculitis. 1. External auditory canal boil: a limited purulent inflammation of the skin of the external auditory canal. It occurs in the cartilaginous part of the external auditory canal because the skin there contains hair follicles, sebaceous glands, and ceruminous glands. Bacteria invade these skin attachments, and the infection forms an abscess. External auditory canal boils can be triggered by ear digging injury, unclean water in the ear, and decreased immunity. 2. Sebaceous cysts secondary infection: blockage of the sebaceous gland ducts in the skin of the external auditory canal can lead to sebum retention, causing localized swelling and the formation of sebaceous cysts, and secondary bacterial infection can lead to pain and a bag inside the ear. Mostly caused by Staphylococcus aureus, Streptococcus pneumoniae and other bacterial infections, resulting in inflammatory pain and localized abscesses. 3. Folliculitis: the hair follicles in the ear skin area are infected by bacteria, if the follicular pore is blocked secondary bacterial infection, can lead to localized folliculitis, inflammation stimulation leads to pain, accompanied by localized swelling and a bag of symptoms. Ear pain and a bag of patients are recommended to timely medical treatment, diagnosis and treatment, usually also need to pay attention to the ear cleanliness and hygiene.