I suggest you take her to the vet and get it checked out asap they will probably give you ointment for your pup , don't ,don't let her lick at it that will make it worse if she does lick it you should put a doggy head cone on her so she cannot reach it, just until you can go to the vet. I hope I could help you. Good luck
If I was you, I would take her to the vet and see what they say. I had this same this thing happen to my dog and if you don't take her to the vet now, it might get a lot worse. Sorry about your dog though!