Neosporin is a combination of 3 topical anti-biotics. Bacitracin, Polymyxin and Neomycin. I would not use it in eyes, ears (not relevant in chams) or on the mouth unless advised by a vet.
Silvadene or silver sulfadine ointment is used more commonly in reptiles but few people have it on hand unless they got it from their vet.