mouth and scale rot

[soupedmx3]

well i just rescued a boa and it has scale and mouth rot
i was told it was taken to the vet and received some injection ill get the name
i was told to apply peroxide to the mouth rot and polysporin to the tail...so i thought id ask if there was any other treatments
im gunna keep trying this for a few weeks and see if it starts to heal and if not im goin to take her to the vet..
i wasnt informed until after i received her that she has not eaten in a month so is there anyway to get her to take food or some type of liquid food i can give her so she can keep her weight?
i will post pics once i get batteries
if u know any treatment i could try before the vets let me know asap
thanks alot
chris