IBD Skin Flares: Pyoderma Gangrenosum and Erythema Nodosum

Posted on July 13, 2026 · Wellness

Content note: Educational content aligned with publicly available patient materials from the Crohn's & Colitis Foundation and other major IBD education sources. Content is used under license from the Foundation for patient education; the Foundation does not endorse IBDPal or MediVue products or services. Last reviewed August 2026. Not individual medical advice.

Educational use only. IBDPal does not provide medical advice, diagnosis, or treatment. Always consult your gastroenterologist or IBD care team for personal decisions.

Skin can flare with IBD even when stools feel quieter. Two names patients hear often are erythema nodosum (EN) and pyoderma gangrenosum (PG). Both need clinician judgment; neither is a do-it-yourself dermatology project.

Erythema nodosum in brief

EN often looks like tender red nodules on the shins. It may rise with gut activity and settle as inflammation is treated. Fever and joint aches can travel with it. Report new painful shin nodules promptly rather than waiting for a routine visit months away.

Pyoderma gangrenosum in brief

PG is rarer and more destructive. It can start as a pustule or bruise-like spot and enlarge into a painful ulcer. Trauma to the skin can worsen it. Do not pack aggressive debridement at home. Dermatology and GI usually co-manage.

Call same day or urgently if

• A skin lesion expands quickly or becomes deeply painful
• Fever with spreading redness
• A surgical or ostomy site looks infected or opens

Send a photo through your patient portal if the clinic accepts images.

Questions for your team

• Is this likely EN, PG, infection, or something else?
• Do we need dermatology this week?
• Should systemic IBD therapy change because of the skin?

Erythema nodosum basics

Erythema nodosum causes tender red nodules usually on shins linked to IBD activity in many patients.

Treating gut inflammation often resolves skin nodules over weeks without separate skin biologics.

Bed rest and leg elevation reduce pain during acute phases.

Pyoderma gangrenosum warning signs

Pyoderma gangrenosum begins as pustules or ulcers with purple undermined borders, often on legs but anywhere.

Trauma or surgery near lesions can trigger expansion. Gentle wound care avoids aggressive debridement initially.

Immunosuppression and biologics treat severe pyoderma alongside IBD control.

Biopsy and mimic exclusion

Skin biopsy distinguishes pyoderma from infection, cancer, and vasculitis.

Start broad infection workup before intensifying immunosuppression when ulcers appear rapidly.

Dermatology co-management standard for pyoderma cases.

Patient coping with visible skin disease

Compression stockings help erythema nodosum pain when tolerated.

Counseling supports distress from slow-healing pyoderma wounds affecting mobility.

Document photos for telehealth when in-person dermatology waits are long.

Leg elevation and compression for erythema nodosum

Elevate legs during flares to reduce shin nodule pain when safe for heart health.

Compression stockings may help some patients after acute tenderness resolves.

Avoid trauma to nodules; pressure from tight boots worsens pain.

Wound clinics for pyoderma gangrenosum

Specialized wound centers co-manage immunosuppression with dermatology.

Gentle non-adherent dressings protect ulcers during biologic loading periods.

Photograph weekly size changes for telehealth wound reviews.

When symptoms shift despite good habits

Return to your GI team if new bleeding, fever, weight loss, or pain appears even when you follow general lifestyle guidance.

Labs and stool markers sometimes change before you feel improvement, and sometimes lag behind symptoms. Your clinician interprets both together.

Do not assume setbacks mean personal failure. Inflammatory bowel disease activity fluctuates and often responds to timely medical adjustment.

Recording what works for your next visit

Keep a brief symptom and lifestyle log for one to two weeks before appointments. Note sleep, stress, meals, and bowel patterns so your clinician sees trends instead of a single bad day.

List medications, supplements, and missed doses honestly. Small adherence gaps help your GI team adjust plans faster than guessing.

Bring one prioritized question from this article so limited visit time addresses what matters most to you right now.

Building habits that last beyond a flare

Choose one practical step from this guide to practice this week rather than changing everything at once. Sustainable habits outperform short strict phases for most IBD patients.

Pair new habits with existing routines, such as taking evening meds when you brush teeth, so they survive busy school or work weeks.

Revisit your plan after travel, holidays, or medication changes because tolerance and priorities shift over time.

Common questions

Are skin flares proof of gut flare?

Often correlated but not always. Check both systems with your teams.

Can steroids alone heal pyoderma?

Sometimes temporarily. Underlying IBD control and specialist skin therapy usually needed.

Should I cover leg nodules?

Loose breathable fabric reduces pain from pressure. Avoid tight boots during erythema nodosum.

Related: joint pain, eye inflammation, flare help.