I had a large burmese years ago that was bitten pretty badly by a huge rat. The rat first bit me as i tried offering it to the snake. It big my finger and its top incisers went to the bone. I jerked my hand and it flew into the cage already mad. My burm immediately grabbed it but it was able to get in one good bite as it was being constricted. This was a bad bite. Just one bite and there was flesh sticking out from the split scales.
My vet was immediately called. He recommended to only use bacitracin. Said neosporin usually has other additives in it that are not good for open wounds. Especially on animals. The bite healed nicely on its own, applying bacitracin twice a day and within a few sheds, was not noticable.
The bite your snake recieved sounds very minor. Snakes have an incredible ability to heal as long as the housing and conditions are correct. Usually even bad bites or wounds that leave a scar will eventually completely disappear in time.
So like everyone else said. I wouldnt worry about it. There really isnt even a chance of infection as long as the wound is not open and their bedding is clean. A small bite like that will just close right up and the scales around it will make it very hard to see.