Cellulitis

A bacterial infection of the skin and the tissues beneath it, usually affecting the face, neck, or legs. Cellulitis is most commonly caused by streptococci bacteria, which enter the skin via a wound. The affected area is hot, tender, and red, and there may be fever and chills. Untreated cellulitis at the site of a wound may progress to bacteraemia and septicaemia or, occasionally, to gangrene. Cellulitis is usually more severe in people with reduced immune response, such as those with diabetes mellitus or an immunodeficiency disorder. Treatment is with an antibiotic such as a penicillin drug or erythromycin. (See also erysipelas.)