Cellulitis is a diffuse, spreading skin infection.

Cellulitis is a skin infection that sometimes accompanies damage to the skin, poor circulation, or diabetes. Streptococcal or staphylococcal bacteria enter the skin through a cut, puncture, ulcer, or sore, producing enzymes that break down the skin cells. Erysipelas is a superficial form of cellulitis.

Infants are particularly susceptible to buccal cellulitis, an infection of the skin on the cheek. The infection is characterized by skin...