It could be anything from sensitivity to a flea bite sensitivity, ringworm, cyst, tumor, buried larvae like a maggot, etc.
Is the small red dot a drainage hole? Does it drain? Does it itch? Did the vet talk about aspirating it with a needle? If the meds are working and it is some type of bacteria or fungus you should start seeing hair regrowth within 10 days I would think. If not, I would think you're dealing with some type of cyst.
Just looked at the pics again - where is this located - could it be where they gave the rabies vaccine? |