What Should I Be Screened for After Pyoderma Gangrenosum?

When you are diagnosed with pyoderma gangrenosum (PG), your care team will evaluate you for other conditions that often accompany it. Research shows that many people with PG have an associated systemic (body-wide) condition, most commonly inflammatory bowel disease (IBD), inflammatory arthritis, or a blood disorder ^[1]. Because published studies look at different types of patients, the reported percentages vary and often overlap. It is also important to know that many people with PG have idiopathic disease, meaning no associated condition is ever found ^[2][3].

There is no one-size-fits-all testing protocol or universal “pan-screening” panel for PG ^[3]. Having PG does not mean you automatically need invasive procedures or whole-body cancer scans. Instead, doctors use a symptom-guided approach.

What is Usually Checked First?

Rather than running every possible test, your care team will typically start with:

• A thorough medical history and review of your symptoms.
• A physical exam, including checking your joints and skin.
• Routine blood work, but only when clinically indicated.
• Continued standard preventive care, including age- and sex-appropriate cancer screenings (like mammograms or routine colonoscopies), which should continue independently of your PG diagnosis.

Summary of Targeted Evaluations

Inflammatory Bowel Disease (IBD)

IBD, which includes ulcerative colitis and Crohn’s disease, is the most common condition linked to PG. Depending on the study, it affects about 17% to 41% of PG patients ^[1][14]. IBD is observed more frequently in PG patients under the age of 65 ^[14].

• What your doctor looks for: Your doctor will ask if you have experienced abdominal pain, bloody or mucousy diarrhea, frequent urges to go to the bathroom, or unexplained weight loss ^[4][5].
• Targeted evaluation: If you have gastrointestinal symptoms, or if blood tests show unexplained iron-deficiency anemia (low hemoglobin or hematocrit, which has many possible causes), your doctor may order specific tests. This might include a stool test like fecal calprotectin to check for intestinal inflammation, or a referral to a gastroenterologist ^[6][7]. When clinically indicated by your symptoms or test results, a gastroenterologist may perform a colonoscopy with biopsies to look for IBD. Stool testing or invasive bowel procedures are not universal screening tests for everyone with PG who lacks symptoms ^[6][3].

Inflammatory Arthritis

Inflammatory arthritis affects roughly 13% to 20% of people with PG, varying by study ^[1][14]. Unlike ordinary “wear-and-tear” osteoarthritis, inflammatory arthritis is an immune system condition and includes rheumatoid arthritis, psoriatic arthritis, and arthritis related to IBD ^[8].

• What your doctor looks for: Joint issues often begin years before PG skin ulcers appear ^[8]. Your doctor will ask about joint swelling, prolonged morning stiffness, and inflammatory back pain.
• Targeted evaluation: A careful history and joint examination are the most important tools. If your doctor suspects rheumatoid arthritis, they may order targeted blood tests to look for specific autoantibodies (proteins your immune system makes when it mistakenly targets your own tissues). However, there is no single blood test that reliably screens for or rules out psoriatic arthritis or IBD-associated arthritis ^[9][3]. A normal blood test does not mean you don’t have inflammatory arthritis, and if your joints are swollen or very stiff, your doctor may still refer you to a rheumatologist or order joint imaging ^[10]. Broad, unfocused autoimmune blood panels are generally not useful without specific joint symptoms ^[3].

Blood (Hematologic) Disorders

Blood-related conditions are found in roughly 5% to 9% of people with PG ^[1][14]. These conditions are observed more frequently in PG patients over the age of 65 ^[14] and those with the “bullous” (blistering) subtype of PG ^[15]. They include non-cancerous conditions like monoclonal gammopathy of undetermined significance (MGUS) and, less commonly, blood cancers like myelodysplastic syndrome (MDS) or leukemia ^[16].

• What your doctor looks for: Your doctor will ask about general warning signs such as severe fatigue, unexplained recurrent fevers, drenching night sweats, easy bruising, or feeling full quickly (which can indicate an enlarged spleen) ^[11].
• Targeted evaluation: A routine CBC may be used to check for abnormalities like low white blood cells, low platelets, or anemia ^[9][12]. Keep in mind that active PG, inflammation, and many common medications can affect blood counts. An abnormal CBC does not automatically mean you have cancer; your doctor will usually repeat the test or review your medications first. If symptoms or blood abnormalities persist, your doctor might order a serum protein electrophoresis test to check for MGUS—a condition that usually causes no symptoms and is simply monitored, as it is not a cancer ^[13]. Only if these initial, less invasive tests show concerning or persistent abnormalities will a hematologist (blood specialist) consider advanced testing, such as a bone marrow biopsy ^[11].

Ongoing Care and Follow-Up

For some people, an associated disease does not appear until after the PG skin lesions start. One observational study noted that when an associated condition developed after PG, it was frequently diagnosed within 24 months, particularly in patients under age 50 ^[17].

This is not a guarantee that something will develop, nor does it mean you need a strict schedule of repeating all tests. It simply highlights the importance of individualized, ongoing care. You should maintain regular follow-up appointments with your care team. If you develop new symptoms—such as persistent bloody stools, rapidly worsening joint swelling, or unusual bleeding—let your doctor know promptly so they can determine if targeted testing is needed.