Under normal circumstances, the skin behind the ear piercing is not easily blocked. If the patient does not turn the ear in time after the piercing, or if there is local infection, pus or scar formation, the skin behind the ear may become blocked. It is not recommended for patients to get it by themselves, as it is easy to have local bleeding and infection, etc. It is recommended that patients go to an ENT clinic or plastic surgery clinic to have the skin behind the ear expanded or partially cut by a professional doctor and then sterilized to avoid the possibility of re-infection and blockage. In general, when the skin behind the ear is blocked, clinical attention should also be paid to the possibility of scar growth, especially if some patients are keloid, once the scar growth is clinically treated, the scar will be removed first, otherwise the effect of forcible expansion is not good.