Please help.Sudden hair loss in patches on limbs.

Here is my cat who is alive only because of this forum. Owe a lot to you guys. He was very sick and malnourished when i found him. With time (almost 4-5 month) he became healthy as any other cat.
I live in India and there are NO VETS who know anything about cats. So , i am solely dependent on you guys.
Summer is approaching and there has been a change in weather, so i thought that this is a seasonal shedding thing. But now its getting worse and patchy. I can see a little bit of skin darkening on the exposed skin. Its only on the limbs mostly the hind legs on the thighs. Thhis started 10-15 days ago and is getting bad day by day. He has had NO food changes as he is on an all raw food diet. No sudden changes in environment or travelling. Just that the summers have come up.
Wonder if its ringworm because i dont have it and its been 10-12 days that this hairloss has started. And the hairloss is at so many places, can it be ringworm?
He doesn't keep scratching himself all day, but i have seen him biting off his fur a few times.
Since I dont have access to a vet, i cant go for a culture.
He is an indoor only 8-9 months old male.

One more thing, its got no redness anywhere. Just a bald patches with diffwerent patterns on all four legs.

Sorry, I have no idea what could be causing that. You said you're feeding an all raw diet. What kind? Are you doing the frankenprey model of 80% muscle meat/10% bone/5% liver/5% other secreting organ?

Yes. Exactly the same ratio .. Learnt it here on TCS ...http://www.thecatsite.com/t/250396/how-raw-diet-and-tcs-saved-my-kitten#post_3267760

I'm not a vet and we're not supposed to diagnose over the internet, but that looks like an allergy to me. Sand gnats maybe?