Sore on back of cat's neck

[csinging]

Our cat adopted us about a year ago. Little is known about him but we fixed him and got shots. He has some acne on his chin. But this morning as we were cuddling like usual I noticed something hard underneath his fur. I parted it and found a hard red scaly bump. I immediately took him into the bathroom and applied hydrogen peroxide and it fissed up. I applied some antibacterial ointment. Here is my real question. What could it be?

[tuxie_cat]

I think you need to take him to the vet if it does not go away. Is he ever outside?

[CatRescuer]

Don't use hydrogen peroxide. It could be fleas or ringworm. If you see black specks put a drop of water on some of them and if it turns dark red, it is fleas. A vet will have to see if it's ringworm. Sometimes ringworm will glow under blacklight but sometimes not.

For the acne, wash the area well and throw out all plastic/ceramic bowls and use glass or stainless steel.