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.

Staphylococcus and streptococcus bacteria are the most common causes of cellulitis.

Normal skin has many types of bacteria living on it. When there is a break in the skin, these bacteria can cause a skin infection. Skin in the infected area will become red, hot, irritated, swollen, and painful.

Risk factors for cellulitis include:

  • Cracks or peeling skin between the toes
  • History of peripheral vascular disease
  • Injury or trauma with a break in the skin (skin wounds)
  • Insect bites and stings, animal bites, or human bites
  • Ulcers from certain diseases, including diabetes and vascular disease
  • Use of corticosteroid medications or medications that suppress the immune system
  • Wound from a recent surgery
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