sounds like a deep blood clot, or if you have a infection it can hit the blood and cause it to be hot to touch too. you NEED to see a dr as soon a possible.
Yes, see a doctor immediately! You could have developed a blood clot which can be deadly if left untreated. The feeling of warmth is a symptom and with having an office job where you sit alot puts you at risk. Please let us know if you see a doctor.
Paula