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The erythema

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A 21- year-old man presented
with a laceration and swelling of the dorsum of his right hand. The laceration
had occurred approximately 12 hours following the patient's having hit
an opponent in the mouth. In this picture, the erythema is more clearly
demonstrated and the remains of a Bar's stamp can be seen across the dorsum
of the hand.
The rapid onset of swelling
and erythema are suggestive of what organism?