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Hello. Thanks for the question.
The swelling should go down over the next 12-24 hours now that the tourniquet is removed. The things to keep an eye on, are color and temperature. If the foot is really cold or if any of the skin is turning black, then I would get him seen right away.
As long as the foot is warm, then we can assume there is blood flow. I would try to do some massage on the foot to help push some of the edema/ swelling up the leg. You can massage from the toes up and also flex/ extend each joint from the toes up. Do this every 2-4 hours. That will help it resolve faster.
I hope this helps, let me know if you have any other questions.