Pyoderma Gangrenosum Is A Potential Skin Complication of IBD

This Skin Disorder Of Unknown Cause Is Related To IBD

Pyoderma gangrenosum tends to start on the legs, but it could show up on other parts of the body as well.. Image © Three Images / Stone / Getty Images

There are many extra-intestinal complications that can occur with inflammatory bowel disease (IBD) including arthritis, liver disease, nutritional disorders, anemia, and skin disorders. Skin disorders are a fairly common problem, and may affect up to 25 percent of people who live with IBD. One type of skin disorder that may occur in patients who have IBD is pyoderma gangrenosum.

What Is Pyoderma Gangrenosum?

Pyoderma gangrenosum is a skin disorder that affects about 5 percent of people with ulcerative colitis and about 1 percent of people with Crohn's disease.

Some of the other diseases associated with pyoderma gangrenosum include rheumatoid arthritis, myeloid blood dyscrasias, and hepatitis. Pyoderma gangrenosum may first appear as a blister, red bump, or pustule, and might be something that looks as though it might heal up on its own. However, the lesion doesn't heal and eventually forms an ulcer. The ulcers may appear alone or in a group, and are commonly found on the extremities, but they appear more frequently on the legs than they do on the arms.

How Does It Start?

Pyoderma gangrenosum may start rapidly at the location of a previous minor injury to the skin, such as a scrape, pinprick, or cut. The surrounding skin breaks down, and an ulcer quickly forms. Pyoderma gangrenosum ulcers have unique purplish-colored, indistinct edges. They also tend to be quite painful as well as slow to heal. Doctors are unsure what causes pyoderma gangrenosum, but theorize that it may be an autoimmune condition, as it is related to other autoimmune disorders.

How Is Pyoderma Gangrenosum Related To IBD?

As many as 50 percent of the cases of pyoderma gangrenosum occur in people with one form of IBD. At times, the occurrence of these ulcers corresponds to an active flare-up of IBD, and may respond when the underlying IBD is treated successfully. Other cases, however, do not appear to be directly related to disease activity, and pyoderma gangrenosum may begin or even worsen when the IBD is quiescent.

How Are The Ulcers Treated?

To confirm the diagnosis of pyoderma gangrenosum through diagnostic testing, a dermatologist may be consulted. The ulcers may be swabbed and cultured to test for infections, and biopsies may be taken and tested to rule out other causes. Because pyoderma gangrenosum is not actually caused by a bacterium, antibiotics may not be effective as treatment.

Smaller pyoderma gangrenosum ulcers may be treated with:

  • Compression bandaging
  • Steroid creams or injections
  • Oral anti-inflammatory antibiotics
  • Dressings of silver sulfadiazine cream or hydrocolloids

Larger ulcers that resistant treatment may require more intense therapy with:

  • Steroids
  • Cyclosporine
  • Cyclophosphamide
  • Methotrexate
  • Tacrolimus ointment

What Should I Do if I Suspect I Have Pyoderma Gangrenosum?

If you have a suspicious lesion, or one that won't heal, see your primary care physician or gastroenterologist as soon as possible for a possible referral to a dermatologist. A dermatology specialist, preferrably one who has experience with other IBD patients, can correctly diagnose and treat this skin condtion.


CCFA. "Extraintestinal manifestations of inflammatory bowel disease." CCFA 1 May 2012. 23 Jun 2013.

Papageorgiou KI, Mathew RG, Kaniorou-Larai MG, Yiakoumetis A. "Pyoderma gangrenosum in ulcerative colitis: considerations for an early diagnosis." BMJ December 3 2005. 23 Jun 2013.

The Merck Manual. "Pyoderma Gangrenosum." Merck & Co., Inc Feb 2012. 23 Jun 2013.

Continue Reading