My poor guy seems to have a large cyst on his paw, how can I treat this infection? Should I take him to the vet immediately? He does not seem to be in any pain; no limping, no whining, just annoyed when I touch his paw. There is also a little hole, I am not sure if it is the pus/infection trying...

Our baby Zoey is a 1 year and 5 months old black and rust doberman. Two days ago we noticed a huge lump protruding from the left side of her face. We took her to the vet and they both said they did not know what was wrong, maybe a spider or bee bite they said. Today the lump and swelling appear...