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Could you send me photos of the your rabbit's leg please?
I am very concerned if you can see open flesh on your rabbit's leg and side. Lots of things could have caused this skin problem such as a wound if your rabbit got injured, urine scald, skin infections, fly strike from maggots in the skin or other causes.
Your rabbit is at high risk of getting an infection and is likely to be in pain if there is open flesh. In hot weather flies can lay their eggs in open flesh and cause fly strike infection too.