If your uric acid is not under control with Allopurinol
then it could be the reason for the painful ankle swelling. The rash
could be part of it. I am not sure of the nature of the rash and hence can't comment confidently over it. But in case of any rash first thing to be tried is Levo-cetrizine
as a very safe medication. If that does not control it then your should see an allergy
specialist or Dermatologist
. See your regular physician also to check that the uric acid is under control and stop eating meat proteins for time being in view of suspected uncontrolled uric acid.
I hope you got the answer. Take care.