most of the times earrings (artificial) have nickel which causes contact allergic dermatitis , the reason for redness, swelling and oozing fluid. possibilities are superimposed secondary infection also. so she should be given a combination of antibiotic and anti allergic. -- topical cream--mupirocin/fusidic acid -3 times application and tablet fexofendine 120 mg once daily .. -7days replace the earring with pure metal (gold/silver) earring if you want to retain the piercing,, otherwise it will be closed during healing , and re piercing will be required.