if there is any puffiness, swelling, or redness under the skin or the appearance of liquid under the skin take your snake to a vet asap. the same applies if the cut is oozing a clearish, pinkish fluid as opposed to actual blood. this is a sign of infection and should be treated quickly. otherwise, keep the enclosure and wound clean and dab with neosporin or triple antibiotic ointment as has been mentioned.