What Causes Redness And Swelling Around The Ear Piercing Site?

Noticed my daughter s ear looked red and swollen around earrings get she had pierced 6 months ago. Looked crusty when I began cleaning it again. Stayed that way for a few days. Cleaning it tonight I was starting to worry so I took the earring out to get a better look. It was very infected and she had a layer of skin that had stabbed and was pulling away from her lope. I saw what looked like white puss so I cleaned and that scab, best way to describe it, came off. So now she has a hole in her lope. I cleaned it and put a bandaid on it so nothing could get in and to catch any blood. She has no fever, no complaints of hurting other than when I touch it. How worried should I be and what kind of infection am I dealing with? Will having her pediatrician call in antibiotics be enough?