Well I feel sheepish! Jasper had a rabies vaccine a couple of weeks ago and the little nodule is where the vaccine was given. It will go away on its...
White vinegar is a good cleaner, I'd clean the floor around her bowl every day, just spray with vinegar and water, wipe it off, then with just water....
I would absolutely not give her any more of the product. It does sound like an allergic reaction, and if it is, the next dose will be even worse. It...