Dear friend,
Cats do not get mange in the way dogs do. However, the do get Milary Dermatitis and ringworm which you can see photo's here:
www.sniksnak.com/cathealth/mil-derm/html
www.fabcats.org/ringworm.html
PLease let me know if any of his lesions look like these. It is also possible he got into a toxin or even ate a critter that had ingested poison, etc.
As long as he is eating put a few drops of fish oil and primrose oil on his food every day. Also see if he will eat some plin yogurt every day as that contains acidopholus and will add "good" bacteria to his system. I would not put anything directly on his fur as he will only lick it off.
Please let me know how this is working and if you have any further questions about this. I will be happy to help in any way possible.
Very sincerely,
Terri
Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri