Help with what looks like a grey greasy fungus on my white long haired cat's tail?

It does not seem to bother him and his hair is not falling out.

Help with what looks like a grey greasy fungus on my white long haired cat's tail?

Is he neutered? If not ,then he probably has "stud tail",an overproduction of a greasy material secreted by the sebaceous gland in the base of the tail.It is caused by hormones produced by intact males.The treatment of choice is neutering,and a medicated shampoo.If the cat is neutered,then it is probably a yeast infection of the skin,which can be treated with anti fungal medication obtained from your vet.If you can't afford a vet,you can buy athletes foot powder or spray with Miconazole nitrate 2% as the main ingredient.Apply twice a day.This is safe (I asked my vet).If the cat is not neutered,please consider having him done.It will make him so much nicer to be around,and he won't be able to father anymore unwanted kittens.He'll stay healthier as well.

Help with what looks like a grey greasy fungus on my white long haired cat's tail?

Yeah,it's pretty common.In neutered cats it's more likely to be caused by yeast,though.I would try the Miconazole foot powder. Thanks for the 10 points! Report It

Help with what looks like a grey greasy fungus on my white long haired cat's tail?

He probably just got into something........maybe crawled under a car. Have you tried washing it off with a wet rag (I'm not suggesting giving him a bath, I've tried bathing a cat before and I would not suggest it to anybody!)

Help with what looks like a grey greasy fungus on my white long haired cat's tail?

Make sure it isn't just grease first and if not then you should see a vet.