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Hello I'm Dr Chip
Did he get x-rays?
This is very serious here and he needs to be seen in the ER
He most likely has one or more fractures in that arm but I'm really concerned about all the swelling--he may have something called compartment syndrome where the injured muscles are swelling under their fascial coverings and that can cut off arterial circulation to the arm and result in gangrene
So at the least he needs to go back to urgent care but at this point I think the ER would be a much wiser option
Please let me know if you need any more information