Black specks on kitty's tail?

Sorry for the terrible picture, he wouldn't stop squirming. On his tail skin are these black specks, and the fur is really greasy (like... REALLY greasy) and there's loads of dandruff. He had (has?) ringworm, it's still in the house but it seems to be off him for now. The fur isn't falling out and there are no scabs or ring shapes on his tail. He doesn't seem to be scratching at his tail and I can't seem to lift the specks up off his skin. He isn't patient enough for me to check every inch of his tail but, from what I've seen so far, it starts at the base of his tail and goes 5 inches up, I'd guess his tail is 11-12 inches.