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Cellulitis (sel-u-LIE-tis) is a common, potentially serious bacterial skin infection. The affected skin is swollen and inflamed and is typically painful and warm to the touch.
Cellulitis usually affects the lower legs, but it can occur on the face, arms and other areas. The infection happens when a break in the skin allows bacteria to enter.
Left untreated, the infection can spread to the lymph nodes and bloodstream and rapidly become life-threatening. It isn't usually spread from person to person.