Cellulitis is a common infection of the skin and the soft tissues underneath. It happens when bacteria enter a break in the skin and spread. The result is infection, which may cause swelling, redness, pain, or warmth.
You’re at risk if you have:
Trauma to the skin
Circulatory problems, such as not enough blood flow to your arms and legs, poor drainage of your veins or lymphatic system, or varicose veins – twisted, enlarged veins near the surface of the skin
Liver disease such as chronic hepatitis or cirrhosis
Skin disorders such as eczema, psoriasis, or infectious diseases that cause sores, such as chickenpox