A 29-year-old man was bitten on the forearm by a wild Gila monster. Radiographs demonstrated subcutaneous air. During a period of observation, erythema and edema progressed from the forearm to the axilla and he developed a significant leukocytosis. No purulence was found upon surgical evaluation. We hypothesize that air was introduced into the wound by the "pulsing," chewing-like action that the Gila monster made while it was attached to the man's forearm.