Edema after an abscess

Hello! My daughter (10 years old) cut her leg two weeks ago (on the outside of her legs just above the ankle, about 10 cm from the floor), 5 joints were stitched, but less passed, the stitches were removed for a week, everything was in order, no measures on rehabilitation did not recommend, that is, we began to live in the usual regime. Today came from school: just below the seam swelling about 1.5 cm in diameter, this place is warmer to the touch and slightly painful, plus again swelling, the suture itself is dry, the child's temperature is 36.8. Called to the ambulance, said until tomorrow saline compress and tomorrow go to the doctor (today the surgeon is not on duty). What could it be? What measures are taken in such cases? Thank you in advance for your help.

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