Ringworm is not really a worm. Wormer will not take care of your problem. Ringworm is called that because the patches and scabs look circular on most cats. It is a FUNGUS, similar to athletes foot.To get rid of Ringworm completely there are three things that you need to focus on: Topical, Environment, Internal. It should take only about three to six weeks if you are consistent. 1. Topical: bathe the kitten with an anti-fungal shampoo once a week for three to six weeks depending on severity. Ketoclor is a good one, and then Sulfurated Lime dip is also very effective (but it stinks) 2. Environment: Isolate the kitten in an easy to clean room (vinyl floor, wood floor, NOT carpeted) and spray the entire environment with a product called "Trifectant" daily. It will kill the spores on contact. So will bleach, but bleach is dangerous to kittens. Just like fleas, ringworm leaves 'babies' or spores that will easily reproduce and worsen the problem if you do not clean the environment. 3. Internal: Ketoconozole is the only product that has ever killed the spores that the kittens ingest by licking their fur. Ask your vet IF the issue is bad, but try the topical and environmental things first with a young kitten. Any vetrinary medicince for ringworm in cats comes with sever warnings of liver and kidney disease. Be very careful. Only give it if really necessary.
Chopping off the kittens tail will not get rid of the ringworm in a cat or kitten, and an open wound may make the ringworm worse, because it festers in open wounds. There has been great success with a new product called Vetericyn (available on-line or in some finer pet stores). It is mild, the cats can lick it without harm and it heals the open wounds.