If a bag grows on top of the ear and hurts when pressed, you should consult a doctor to find out the cause of the disease, which may be caused by boils, sebaceous cysts with infections, etc. You need to carry out targeted treatments under the guidance of the doctor, such as medication, surgery, and so on. 1. Boils: at first, small hard nodules with redness, swelling, heat and pain appear locally, and then gradually swell up and become conical in shape. In the early stage, 20% ichthyolite ointment and 3% iodine tincture can be used externally, and mupirocin ointment can also be used to smear the lesion; in the late stage, if the boil has already suppurated and broken down, incision and drainage of pus should be considered as the treatment. 2. Sebaceous cysts: due to the obstruction of sebaceous gland ducts gradually forming cysts, sebaceous cysts in the ear are commonly found in the earlobe area. Smooth and movable cysts can be touched in the earlobe; when sebaceous cysts become infected, they will become red and swollen and cause pain. Oral antibiotics such as cephalosporins or azithromycin can be used to treat the infection; when the infection is fully controlled, the sebaceous cyst will need to be removed. There may be other factors, but this symptom alone is not enough to diagnose the disease. It is recommended that the patient consult a doctor in time to find out the cause of the disease, and standardize the use of medication and treatment under medical advice.