If your cat has a raw spot, contact their veterinarian.  If the spot is large, the vet may want to see your cat. This way they can ensure that the wound gets properly cared for.  They may recommend using an antibiotic powder or ointment.  If the cat will be able to lick the wound or the antibiotic, be sure to put an Elizabethan collar on her to prevent her from being able to do so.