Is there a cure for impetigo?

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.