My bullmastiff gets pimple like cuts on his face and we put neosporin on them to soothe him. He doesnt mind it because there is no sting and it seems to keep away infections. If the sores are large, or continue to get larger, then you should let the vet give you a proper antibiotic. I would go to the vet anyway, but in the meantime there is no harm in a little neosporin
Edit: The neosporin does help the bandage to not stick to the cut. Sometimes, the cut heals with the gauze so when you peel it off, you re the wound. The neosporin prevents that and the same time keeps away infection and soothes your dogs sore. Good luck hope your dog feels better!