Our six month old daughter started out with a mild fever which we thought was related to teething. After 24 hours, we noticed a large swelling behind her jaw and in front of her ear. We suspected the swelling was related to a bug bite. After 12 hours, the swelling became very large, hot and painful for her. We took her to the Children's Hospital. They said the infection was severe and involved a lymph node. The lymphadenitis was described as a phlegmon. After two days of I.V. antibiotics (Unasyn), surgery was performed to help it drain. She's on the mend, but this could be very scary, if not deadly. Bad stuff.