I Have Pain In My Top Right Thigh When I

I have pain in my top right thigh when I walk...im on blood thinner due to clots from brain tumor surgery. ...I had blod clots befor in both legs and hospitalized till they loosen up..they tell me they will never go away..but my question is .is that why my leg hurting again? Only difference this time is its not swelling like before and is it something I should see doc for?