Pyoderma Gangrenosum
Pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis marked by rapidly enlarging, intensely painful ulcers with dark violet or gray-blue, undermined edges. Despite the word "pyoderma" in its name, it is not caused by bacteria and is not contagious. About 50% of cases are linked to a systemic disease such as ulcerative colitis, Crohn disease, rheumatoid arthritis or a blood disorder.
At Haute-Derma, we treat pyoderma gangrenosum as a dermatologic condition that needs special, urgent handling. It is not an ordinary infection but a serious autoinflammatory disorder. Our approach centers on careful diagnosis by exclusion, control of severe pain and modern biologic therapy to halt tissue destruction and preserve as much healthy skin as possible.
How We Diagnose Pyoderma Gangrenosum
There is no specific test for pyoderma gangrenosum, which makes diagnosis challenging. At Haute-Derma, we follow a rigorous process of exclusion:
- Characteristic clinical findings: We look for an ulcer with a violet, undermined edge and for pathergy—new or worsening ulcers after minor trauma or an invasive procedure.
- Dermoscopy: Shows dilated, polymorphous vessels and a central area of necrosis without true bacterial pus.
- Skin biopsy: Taken carefully from the ulcer edge to look for a dense neutrophilic infiltrate and vasculitis. At Haute-Derma, biopsies are performed with particular care to minimize the risk of pathergy.
- Screening for systemic disease: Endoscopy, rheumatologic markers (RF, anti-CCP) and a bone marrow examination if an associated blood disorder is suspected.
- Differential diagnosis: Ruling out ulcers from vascular occlusion, deep fungal infection, drug-induced necrosis and necrotizing vasculitis.
Common Clinical Variants
The main forms of pyoderma gangrenosum are:
- Ulcerative PG: The most common type, usually on the legs. It starts as a red papule or pustule that quickly breaks down into a widening ulcer.
- Pustular PG: Often associated with inflammatory bowel disease (IBD); presents as painful pustules that do not progress to deep ulcers.
- Bullous PG: Often associated with blood disorders; characterized by spreading gray-blue blisters.
- Vegetative PG: A milder, slowly progressive form, usually a single vegetating ulcerated plaque that is less painful than the other types.
How Pyoderma Gangrenosum Is Treated at Haute-Derma
We use a multimodal treatment plan to rein in the immune system's attack on the skin:
- High-dose corticosteroids: Given orally or intravenously to stop the ulcer from spreading as quickly as possible.
- Systemic immunosuppressants: Cyclosporine or mycophenolate mofetil is added to maintain control and reduce reliance on steroids.
- Biologic therapy: At Haute-Derma, we use TNF-alpha inhibitors (such as adalimumab or infliximab) for refractory cases or those linked to Crohn disease, often with impressive healing.
- Specialized wound care: Advanced non-adherent dressings keep the wound moist so it can heal on its own. Mechanical debridement must be avoided during active disease, as it makes the ulcer larger.
- Multilevel pain control: Systemic pain relief combined with local measures so patients can go about daily life during treatment.
