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There are fleas about everywhere!
The only way to tell if the kitten has ringworm is to test for it; you can't tell just by looking at the skin. Your vet could shine a "Wood's lamp"on the dermatitis; about 80% of cases of ringworm will glow under this special UV light. A simple culture of hairs will also tell if this is ringworm, which is a fungal infection.
I would get Midnight out if you can, put some Advantage on him, but I would not send him where other cats are. They have established a territory, and may drive him away. I would bring him home, and if he can't be indoors, keep him in a garage with food and water and a bed for a few days to a week before letting him go out to explore the neighborhood.
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