Ear piercing may have some harm, the common harm mainly includes obvious pain, scarring, redness, swelling and pus. 1. Obvious pain. The distribution density of pain sensory nerves on the cartilage of the ear is large, if the ear is pierced here, it is difficult for the patient not to feel obvious pain. 2. Scarring. Some people with keloid body may have obvious scarring after ear piercing, which seriously affects the aesthetics. 3. Redness, swelling and pus. If the tools used for ear piercing are not clean and hygienic enough, the wound may become infected, resulting in localized redness, swelling and pus in the ear. It may lead to purulent auricular perichondritis. It is recommended that people who need to have their ears pierced should try to go to regular hospitals or organizations to perform the relevant operations, so as to avoid serious consequences.