Hi Stephanie,
The main problem with a OTC med/treatment is cats are very sensitive to these type of products - especially those, like yours, that already have their health compromised.
For more of a natural remedy - Aveeno products are suppose to be very good for cats and dogs with skin problems. Along with oatmeal, baking soda or epsom salt baths.
However I would hope to control the underlying problem - the allergies -because no matter what we do on the 'outside,' the 'inside' problem will still exist. Because you didn't say a specific allergy, I'm assuming you do not know. Would it be possible to have your vet refer you to a skin disorder/allergist specialist? What about different food? Food allergies are very common in cats and switching to an allergen free or all natural food can greatly benefit.
Assuming this has not been going on for his entire life, can you think back as to when it started - what could have changed in his environment back then? Food, litter, bedding, laundry detergent, your soap or lotion, and so on. I really suggest the need to find out the specific allergy your cat is suffering from so we can resolve the entire problems he is having. Make sense?
Let me know what you think...
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Oliver's Mom