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Ringworm is not a true worm; it is a fungal infection of the skin. Deworming medications are useless for it. However, athlete's foot creams and vaginal yeast infection creams generally work well (I prefer the former unless it is close to a mucous membrane). Ringworm generally comes along with very obvious scaley looking, irritated skin however, so if the OP isn't noticing that I would be inclined to think it is something else.
The skin condition can be a number of things. Flea allergy is very common, so I would first check for that. Even if he stays indoors, if you have any pets that go outdoors, the cat should probably be on a monthly flea preventive if he isn't already. If there are no fleas, the second most likely thing I could think of would be a food allergy. They are fairly common in cats and are often linked to either "fillers" or protein items. Trying a grain free food or food that is corn/soy/wheat free, or alternately buying a limited ingredients diet that uses an alternative protein may help, as may supplementing the diet with omega 3's. General allergies (seasonal/not diet related) are also possible and can often be treated with over the counter feline allergy medicines or an appropriate dose of benadryl - and topical feline anti-itching sprays may help as well. Finally, there are a number of medical conditions ranging from bacterial and fungal infections of the skin (these usually have a foul odor and discharge, however), thyroid conditions, cancers, and a number of other problems could be the cause, so if you rule out flea dermatitis, food allergy, and environmental allergy it might be time to worry and perhaps ask a friend or family member about some financial help for kitty to see the vet.
Good luck, I hope he feels better soon.
I agree with Ingrid. I have an ALMOST 20 year old Himmy that was constantly scratching herself. She had no fur left on her neck, and was also scratching near her back. I took her to the vet. She said it was a food allergy and the only way to find out what she was allergic to was through process of elimination. Cats are apparently very allergic to wheat and fish. I stopped the fish, still scratched. Stopped the wheat gluten, she's fine. She was allergic to wheat gluten. You should see me in the grocery store reading cat can labels
It makes you wonder how they would survive outside. My cat is allergic to oak pollen, ragweed, and rats!
We had to get rid of the pet rats.