Impetigo. Antibiotics which can be helpful include penicillin derivatives (such as augmentin) and cephalosporins such as Cephalexin (keflex). If clinical suspicion supported by culture results show other bacteria, such as drug-resistant staph (methicillin-resistant staphylococcus aureus or mrsa), other antibiotics such as Clindamycin or trimethoprim-sulfamethoxazole (bactrim (sulfamethoxazole and trimethoprim) or septra) may be used.
Yes - antibiotics. If it is fairly mild, topical antibiotics will work (a cream or ointment), but if it is more severe you might have to take oral antibiotics.
Yes. If impetigo is in a small area, mupirocin ointment (by prescription) is very effective. If it is more widespread, certain oral antibiotics will help.