On my ear around the earring hole, it appears to be very dry. idk if it's a rash or what but time to time a sore bump will appear. what is this?

Contact Dermatitis?: It is very common to have an allergy to a metal in an earring that typically starts in the earring hole. Sometimes it can become secondarily infected. I would start with an over the counter topical antibiotic once daily and a topical Hydrocortisone also once daily. Avoid earrings with nickel. If this doesn't work you should be evaluated by a dermatologist.