Cellulitis is an infection of the skin and the layer of tissue under the skin.
Cellulitis most often develops on the legs but can be seen on the face and on any other skin on the body. It tends to affect a fairly large area of skin. Cellulitis is usually due to an infection of the skin with bacteria, but it may also be caused by a fungus.
Cellulitis is usually caused by a break in the skin that becomes infected with bacteria or fungi. It can occur in wounds caused by injury and in surgical wounds. It can also occur when there is no obvious break in the skin.
Risk factors for cellulitis include the following: