The growth of a bag inside the ear is considered to be caused by folliculitis, sebaceous cyst, ceruminous adenoma and other diseases. 1. Folliculitis: a common inflammatory skin disease of hair follicles, can occur in any hair follicle part of the body, head, face, neck and thighs, etc. If the hair follicle inside the ear is inflamed, it can also cause folliculitis in the external auditory canal. It can lead to red lumps around the localized hair follicles, pus, itching and pain, and other uncomfortable symptoms. 2. Sebaceous cysts: Sebaceous cysts on the skin inside the ear can also lead to a bump on the local skin. Sebaceous cysts are mainly caused by the obstruction of sebaceous ducts and the accumulation of glandular secretions. 3. Ceruminous adenoma: It is a benign tumor that occurs in the ceruminous glands of the external auditory canal. As the local tumor increases in size, it can also lead to the appearance of a lump inside the ear, and is accompanied by ear pain, ear itching, and hearing disorders and other uncomfortable symptoms. There are many reasons for the growth of a lump in the ear, so you should go to the hospital in time to consult and clarify the specific cause of the disease, and carry out treatment under the guidance of the physician.