If its new, try to go back to your piercer. If its older or you aren't able to see your piercer:Soak the jewelry in alcohol and then wash it with soap. Clean the actual piercing with sea salt and water or just a really gentle soap. Dont actually pu the soap in the piercing. Just clean the outside so that you wont push any junk through the piercing when re-inserting jewelry. Wash your hands REALLY well with an antibacterial soap and if possible, wear gloves. Try reinserting the jewelry. If its already closed up, don't force it through. You have to go back to your piercer and get it redone. Make sure to keep cleaning the piercing with the sea salt and water to prevent infection. Taking vitamins can help boost your immune system too.