How is cellulitis diagnosed?

Your healthcare provider may know you have cellulitis by looking at and feeling your skin. Tell them how long you have had symptoms, and if anything helps decrease your symptoms. Tell them if you have ever had a cellulitis infection. You also may need any of the following tests:

  • Blood tests may show which bacteria is causing your infection.
  • A sample of fluid from one of your sores may show what kind of germ is causing your infection.
  • A sample of tissue from your infected skin may show what germ is causing your infection. The sample may also show if your infection is caused by another kind of skin disorder.
  • An x-ray, ultrasound, CT, or MRI may show if the infection has spread. You may be given contrast liquid to help the infection show up better in the pictures. Tell the healthcare provider if you have ever had an allergic reaction to contrast liquid.
  • If you need an MRI scan you must inform the staff if you have any metal in or on your body including jewellery, piercings, joints or pacemakers.