John,

A Google search is very fast on this. It appears to promote bood flow in the extremities. I'm no doctor, but it sounds like it could be a problem in pending, or recent, surgery. What are they doing about this fistula? It really sounds like you need a specialist in non-healing wounds. I try so hard not to make statements like this, but a fistula is not generally cosidered the sign of a successful procedure. I had one develope and they went right back in to correct it, you need that addressed.

Glenn