I Had Knee Surgery Then Developed Two DVT One In

i had knee surgery then developed two DVT one in the lower part of my leg and one behind my knee I am taking xarelto plus pain medications and muscle relaxers but my leg is in pain and someone told me to put a heat pad on my leg what do you think? I am sorry I didn't realize there was a charge I will wait and ask my doctor when I go next time and just not use the heat tonight.