I believe this might qualify as an emergency.

[rg_girlca]

Poor dear Soni. What did you do sweetie.

My opinion is that it sounds like an abcess. Keep cleaning it and applying ointment to it. I'm glad that you have your Mom to help you out, but you will have to get him to the vets for some antibiotics for the infection and I'm not to sure if you should be putting gauge on it. When one of my cats had an abcess on his leg, the vet said to just keep it clean and not to cover it.
Mind you that was like eons ago, so maybe things have changed since then.

Good luck and ((((((HUGS)))))) as I know how worried you must be.

Little Soni will be in my prayers that he has a full and speedy recovery.