Erythromycin ointment should not be applied after ear piercing. Erythromycin ointment is not recommended because of the fresh trauma after ear piercing. The instructions also do not express that it can be used for topical application on trauma. Erythromycin ointment belongs to macrolide antibiotics, can play the role of sterilization, anti-inflammatory and inhibit the growth of bacteria, but it is not recommended to use after ear piercing, you can cooperate with the doctor to choose iodine volts to apply, which is conducive to ear piercing parts of the clean and disinfection, to prevent secondary bacterial infection. Avoid getting wet before the trauma heals after ear piercing, which can reduce the chance of infection. It is recommended to pay more attention to local care after ear piercing, keep the local clean and dry, and eat a light diet, do not eat spicy and stimulating food. If infection occurs, you need to cooperate with the doctor to use medication.