There are two possibilities when your ear piercing swells up: one is an allergy; the other is a case of infection. Both require discontinuing the current ear jewelry and giving anti-allergy or anti-infection treatment. If the ear hole is red and swollen with an itchy discomfort, it is considered that the ear jewelry is causing an allergy. In this case, you should stop wearing the jewelry and take oral desensitizing medication, such as loratadine tablets, or you can apply topical hormonal creams, such as Denide cream, etc. If the ear hole is swollen and painful with yellow water, it may be infected and can be treated with topical furacilin solution and topical Bactrim ointment or fusidic acid cream. If the treatment is not effective, oral antibiotic treatment can be considered. Therefore, the redness of the ear hole should be distinguished from allergy or infection, and then the corresponding symptomatic treatment should be given.