I have a 1year old Bengal ,in the last 2 months he hasn't stopped licking himself down to the bare skin
i went to the vet numerous times , he has received antibiotic shots, blood test, and now he is on antibiotics
the problem is still there and he wont stop licking himself , in certain areas on his body its just bare skin

any suggestions will help a lot

Thank you in advance

I might suggest a stocking of some sort to go around the area that is bald to keep your kitty from aggressively licking that area. Your vet has checked him out and obviously has not seen any type of irritation there. Some cats just get into over-grooming.

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The little monsters 3

i have had him since last year when he has 2-3 months old, he is not an outdoor cat, but hangs out on the balcony once in awhile.
nothing has changed in my living space, iam also thinking maybe my home could be dry , i have just turned on the humidifier
the food has been changed to Hypoallergenic duck meal from Royal Canin, iam thinking of changing it Venison or Rabbit

Are there any natural products i can use

I think you need to simply try different things until you find something that works. A humidifier could do the trick.