Causes of Cellulitis

Cellulitis is caused by a type of bacteria entering by way of a crack in the skin.This crack may not be visible.The two most common types of bacteria that cause cellulitis are streptococcus and staphylococcus which are part of the normal flora of the skin but cause no actual infection until the skin is broken. Predisposing conditions for cellulitis include insect bite, animal bite, pruritic skin rash, recent surgery, athlete’s foot, dry skin, eczema, burns and boils. Areas of dry, flaky skin also can be an entry point for bacteria, as can swollen skin.This reddened skin or rash may signal a deeper, more serious infection of the inner layers of skin. Once below the skin, the bacteria can spread rapidly, entering the lymph nodes and the bloodstream and spreading throughout the body.Cellulitis is most common on the lower legs and the arms or hands, although other areas of the body may sometimes be involved. If it involves the face (erysipelas), medical attention is urgent. People with fungal infections of the feet, who have skin cracks in the webspaces between the toes, may have cellulitis that keeps coming back.



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