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This is Dr. David
there is a small chance you could have a blood clot causing swelling and warmth in the leg from your flights
the best way to know for sure is to go to the ER and get an evaluation by a doctor there and an ultrasound of your leg.
an ultrasound will be able to tell for sure if you have a blood clot or DVT
mild swelling and warmth could also be an early cellulitis infection possibly.
do you have an ER or hospital close to you?