When a patient has a bag behind the ear, it needs to be clarified whether it is formed by inflammatory irritation or whether it is indeed a swelling that has grown. Patients sometimes often touch their ears with their hands after piercing them, which is particularly likely to induce the formation of an infection that leads to the growth of an inflammatory packet behind them. So if this is the case, it is recommended that patients actively disinfect with iodophor, after which they can apply Bactrim cream for active anti-inflammation, and if necessary, they can take oral roxithromycin dispersible tablets, and the active anti-inflammation should subside significantly in about a week. However, if the swelling is caused by a swelling, it often needs to be removed. The swelling includes a keloid behind the ear, which is caused by piercing the ear, or sometimes a sebaceous cyst behind the ear, and no matter which of the above is the case, it needs to be completely removed through local anesthesia surgery.