C ellulitis is the bacterial infection of the skin and underlying tissues that causes redness and swelling in cellulitis an area of the skin and underlying tissues become infected to bacteria that enters through a small possible unnoticed wound. the infection causes redness, pain and swelling and most commonly affected the legs. cellulitis may lead to boils and carbuncles. causes Elderly peoples are especially vulnerable to cellulitis because many of them have poor circulation, which leads to oedema or leg ulcers. these problems increase the risk of infection. other risk factors for cellulitis include intravenous drugs abusers insects bites and stings, bites animals (skin wounds) diabetes and aids recent cardiovascular, pulmonary (lungs), dentals or other procedure symptoms Redness and swelling , that increases in size as the infection spreads Warmth in the affected area in the area Pain and tenderness in the area Fever and ...