A heat sensation or sudden feeling of warmth can be a sign of blood clot or deep vein thrombosis. It can also be due to pinched nerve or due to diabetic neuropathy. If you are a female and on birth control pills, then this could be due to the side effect of pills as they can also cause deep vein thrombosis. For diagnosis first a duplex ultrasound or color dopplar would need to be done. If this is negative then a nerve conduction study and test for diabetes. If there is a chance then if everything else is negative, then lupus may need to be tested for. Other possibility is contact dermatitis or an insect bite. Please consult your PCP for primary examination followed by proper referral. Take care!
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