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I am sorry to say but heat sensation can be a sign of blood clot or deep vein thrombosis. This can be diagnosed by duplex ultrasound. It can also be due to pinched nerve or due to diabetic neuropathy. If you are on birth control pills (in females), then this could be due to the side effect of pills.
It is difficult to comment beyond this at this stage. Do discuss this with your doctor and get yourself examined.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
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