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Take your earrings out every night. Clean your earrings with rubbing alcohol. Swab your ears with a cotton swab and alcohol and apply antibiotic ointment.
Be sure your piercings have fully healed before removing them at night. Taking earrings out while you sleep will prevent your earrings from snagging during your sleep. It also will allow air to contact the skin, which will help keep your ears healthy. Dip a cotton swab in alcohol. Rub it over the posts when your earrings are out for the night.  Doing this regularly will help keep the earring free of germs that can cause infection. Do this once a month, or if your piercings ever begin to feel tender. Regularly treating the ear piercings will reduce the chance you ever have to deal with your piercings becoming infected.