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Pyoderma gangrenosum - Anogenital in
See also in: Overview,Cellulitis DDx
Other Resources UpToDate PubMed

Pyoderma gangrenosum - Anogenital in

See also in: Overview,Cellulitis DDx
Contributors: Jeffrey M. Cohen MD, Vivian Wong MD, PhD, Susan Burgin MD
Other Resources UpToDate PubMed

Synopsis

Pyoderma gangrenosum (PG) is an inflammatory, noninfectious, ulcerative neutrophilic skin disease of uncertain etiology commonly misdiagnosed as an aggressive skin infection. Pustules form and give way to ulcers with a necrotic, undermined margin. PG can affect any age and take on a number of differing clinical presentations. PG can have either an acute or chronic course and result in extensive scarring. There is no predilection for sex or any population. The disease occurs most often in middle-aged adults. Genital PG has rarely been reported.

The two primary variants are a classic ulcerative form, which often involves the lower extremities, and a vesicobullous form, which is more superficial and tends to occur on the upper extremities, including hands. Fever, toxicity, and pain can be associated with the onset of PG. Extracutaneous manifestations may take the form of sterile neutrophilic abscesses, such as in the lungs, heart, gastrointestinal tract, liver, eyes, central nervous system, and lymphatic tissue.

Though the exact cause is unknown, neutrophil dysfunction, inflammation, and genetics are all thought to play a role. Additionally, PG has associations with a number of systemic illnesses. In about 50% of cases, there is an association between PG and systemic diseases such as ulcerative colitis, Crohn disease, arthritis, myeloma, leukemia, monoclonal gammopathy, granulomatosis with polyangiitis (formerly known as Wegener granulomatosis), collagen vascular disease, and Behçet disease, among other disorders. Surgery by itself can be a precipitating cause. Levamisole-contaminated cocaine has been associated with PG lesions ranging from vesicopustules to bullae to larger ulcers; most patients demonstrated positivity for antiphospholipid or anticardiolipin antibodies.

PG tends to be self-limited. First-line therapies are widely accepted, while alternative therapeutic recommendations are largely based on anecdotal evidence. Surgical intervention is a common exacerbating factor because PG demonstrates pathergy, a phenomenon by which skin trauma can lead to worsening disease.

Codes

ICD10CM:
L88 – Pyoderma gangrenosum

SNOMEDCT:
74578003 – Pyoderma gangrenosum

Look For

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

Ulcers:
Pustules / nodules:
The differential diagnosis for an immunocompromised patient also includes:

Best Tests

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Management Pearls

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Therapy

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Drug Reaction Data

Below is a list of drugs with literature evidence indicating an adverse association with this diagnosis. The list is continually updated through ongoing research and new medication approvals. Click on Citations to sort by number of citations or click on Medication to sort the medications alphabetically.

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References

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Last Reviewed:12/05/2016
Last Updated:05/12/2020
Copyright © 2021 VisualDx®. All rights reserved.
Pyoderma gangrenosum - Anogenital in
See also in: Overview,Cellulitis DDx
Pyoderma gangrenosum : Painful skin lesions, Skin ulcer
Clinical image of Pyoderma gangrenosum
A close-up of a large ulcer with surrounding re-epithelialization.
Copyright © 2021 VisualDx®. All rights reserved.