I'm sorry that I took so long to answer your question. I had to put one of my kitties to sleep recently and life is hard.
By now I hope you've taken your kitty to the vet for antibiotics probably and an exam. It sounds like an abcess but due to what only a vet can deduce.
Don't ever put human medicine, products of any kind on or in your kitty.
If you could please write either me or the forum to let us know how your kitty's situation turns out. Please.
Blessings,
Melinda