text: No one can diagnose over the Internet from a 2nd hand description. Your friend should see a doctor.\n\nThe usual treatment if it's not broken would be the "RICE" method: Rest, Ice, Compress, Elevate.  Ace bandage, put it up with ice on it, don't use it. \n\nBut again, it could be cracked or something, and it's always better to see a doctor and be sure.