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Tragus bump question

In the front of my piercing I have a small bump it’s red at the moment but I had it before and it went away after awhile and I got it again how do I get rid of it and how do I prevent it? I tried to take a picture from the side and top view. Is there things I can use to fix it I heard tea tree oil but idk which on to get if I get it and is there any other ways??