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Pyoderma Gangrenosum: Association of Ulcer Size With Clinical Characteristics and Healing Outcomes
Jacqueline Jiang1, Edmund Wee2, Dale Jobson1
1Department of Dermatology, St Vincent's Hospital Melbourne, Fitzroy, Victoria, Australia.
The Australasian Journal of Dermatology
|June 23, 2026
Summary
Pyoderma gangrenosum (PG) ulcer size significantly impacts healing outcomes. Larger ulcers (≥64 cm²) are linked to slower healing, increased recurrence, and poorer healing after recurrence, highlighting size as a key prognostic factor.
Area of Science:
- Dermatology
- Clinical Medicine
- Inflammatory Diseases
Background:
- Pyoderma gangrenosum (PG) is an ulcerative inflammatory dermatosis with poorly defined diagnostic and therapeutic strategies.
- Evaluating clinical characteristics and healing outcomes based on ulcer size is crucial for PG management.
Purpose of the Study:
- To assess the relationship between pyoderma gangrenosum ulcer size and patient healing outcomes.
- To identify prognostic indicators for pyoderma gangrenosum based on ulcer dimensions.
Main Methods:
- Retrospective review of 81 pyoderma gangrenosum cases from a tertiary hospital (2011-2024).
- Classification of ulcers into small (<64 cm²) and large (≥64 cm²) categories.
- Analysis of healing rates, time to healing, recurrence, and treatment requirements.
Main Results:
- Large ulcers were associated with peripheral vascular disease and advanced systemic treatments.
- After adjusting for confounders, large ulcers showed lower initial healing rates, higher recurrence rates, and longer healing times (p < 0.05).
- Ulcer size was not significantly associated with demographic factors or specific comorbidities like inflammatory bowel disease or diabetes.
Conclusions:
- Pyoderma gangrenosum is a debilitating condition with frequent recurrences and slow healing.
- Ulcer size is a significant predictor of healing outcomes and recurrence in pyoderma gangrenosum.
- Stratifying patients by ulcer size offers valuable prognostic information for expected disease course.
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