Adamantiades-Behçet Disease
Behçet disease (also called Adamantiades–Behçet syndrome) is a chronic, multisystem autoinflammatory disorder marked by recurrent inflammation of arteries and veins of every size, from tiny capillaries to large vessels. It classically shows up as a triad of recurrent mouth ulcers, genital ulcers, and uveitis. The skin and mucous membranes are usually the first organs involved and are central to making the diagnosis. Genetic susceptibility (especially the HLA-B51 allele), combined with environmental triggers such as the oral bacterium Streptococcus sanguinis, sets off excessive activation of neutrophils and Th1/Th17 T cells. At Haute-Derma, we diagnose Behçet disease using the International Criteria for Behçet's Disease (ICBD), perform dedicated pathergy skin testing, and build a multidisciplinary treatment plan to control mucosal ulcers and vasculitic skin lesions and to prevent necrotic scarring.
How the disease develops at the cellular and immune level:
- Neutrophil Hyperactivation and Infiltration:
- Neutrophils in people with Behçet disease are in a primed state: they migrate more readily (chemotaxis), release too many reactive oxygen species (ROS) and protein-digesting enzymes (elastase), and form neutrophil extracellular traps (NETs).
- Dense neutrophil infiltration around small vessels in the epidermis and dermis damages and kills endothelial cells, causes fibrinoid necrosis, and produces deep erosions and ulcers.
- The Pathergy Phenomenon:
- This is the skin's characteristic exaggerated inflammatory response to minor trauma, such as a needle prick.
- Right after even a tiny injury, neutrophils flood the needle site and release large amounts of pro-inflammatory cytokines (IL-1β, TNF-α, IL-8), producing an inflamed pustular papule within 24–48 hours.
- T Cell–Mediated Immunity (Th1/Th17 Axis) and Leukocytoclastic Vasculitis (LCV):
- An imbalance between regulatory T cells (Tregs) and CD4+ T cell subsets (Th1, Th17) drives overproduction of IL-17, IL-23, and IFN-γ.
- This keeps small-vessel inflammation (leukocytoclasia) and superficial thrombophlebitis going, producing a wide range of skin lesions, from acne-like pustules to erythema nodosum–like plaques on the shins.
Skin and Mucosal Signs of Behçet Disease
| Clinical Feature | What It Looks Like | Cellular and Molecular Mechanism |
|---|---|---|
| Recurrent Oral Ulcers (Aphthous Stomatitis) | Round or oval ulcers with a gray-yellow base and a raised red border, very painful; found on the lips, cheeks, and tongue; recur at least 3 times a year. | Neutrophil infiltration causes necrosis of the mucosal epithelium and destroys the small vessels beneath it. |
| Genital Ulcers | Deep, ragged ulcers with a necrotic pseudomembrane at the base, very painful; on the scrotum/penis (men) or vulva/vagina (women); often scar on healing. | Deep necrotizing vasculitis beneath the genital mucosa, with loss of granulation tissue and structural fibrosis. |
| Erythema Nodosum–Like Lesions | Dark red, firm, very tender nodules under the skin, mainly on the front of the shins; fade to bruise-like dark patches. | Inflammation of the fat septa (septal panniculitis) combined with vasculitis in the subcutis. |
| Acne-Like Pustules (Pseudofolliculitis / Acneiform Lesions) | Pustules on a red base on the back, chest, and face; unlike ordinary acne, there are no blackheads (comedones). | Sterile neutrophil infiltration around hair follicles and sebaceous glands driven by the pathergy response. |
| Positive Pathergy Test | A red papule or pustule larger than 2 mm appearing 24–48 hours after a sterile needle prick 5 mm deep. | Neutrophil hypersensitivity to microscopic mechanical trauma. |
Behçet Disease vs. Other Causes of Mucosal Ulcers and Vasculitis
| Behçet Disease (Adamantiades–Behçet) | Common Recurrent Aphthous Ulcers | Reiter Syndrome / Reactive Arthritis |
|---|---|---|
| Genital ulcers common, deep, very painful, and scarring | Rare or absent | Shallow, round, usually painless erosions (circinate balanitis) |
| Uveitis (risk of blindness) | Absent | Conjunctivitis or mild anterior uveitis |
| Pathergy test often positive (specific) | Negative | Negative |
| Erythema nodosum + acne-like pustules | No skin signs | Keratotic plaques on the soles (keratoderma blennorrhagicum) |
| Strongly linked to HLA-B51 | No clear HLA association | Strongly linked to HLA-B27 |
Our Approach
At Haute-Derma, patients with suspected Behçet disease are assessed strictly according to the International Criteria for Behçet's Disease (ICBD) scoring system:
- Clinical Criteria (ICBD Score):
- Genital ulcers (2 points), ocular uveitis (2 points), recurrent oral ulcers (2 points).
- Skin lesions: erythema nodosum, acne-like pustules (1 point).
- Positive pathergy test (1 point); vascular or neurological involvement (1 point each).
- A score of 4 or more confirms the diagnosis of Behçet disease.
- Standardized Pathergy Skin Testing:
- A sterile 20G needle is inserted at a 45° angle into the inner forearm to a depth of 5 mm.
- The result is read after 24–48 hours: the test is positive if a red papule or sterile pustule 2 mm or larger appears at the needle site.
- Multidisciplinary Review and Vascular Screening:
- Referral to ophthalmology for slit-lamp and fundus examination to detect anterior or posterior uveitis and retinal vasculitis.
- Doppler ultrasound of the leg vessels to screen for deep vein thrombosis (DVT) or arterial aneurysms.
Treatment Options at Haute-Derma
Our treatment plan for Behçet disease at Haute-Derma focuses on calming acute vasculitis flares, healing mucosal and skin ulcers quickly, and working with other specialists to control systemic complications:
- Medical Treatment to Control Inflammation and Neutrophil Activity:
- Colchicine (1.0–1.5 mg/day): First choice for skin and mucosal lesions and mild joint pain, because it blocks neutrophil migration.
- Topical and Intralesional Corticosteroids: Triamcinolone acetonide gel for mouth and genital ulcers; intralesional corticosteroid injections for firm, indurated erythematous nodules.
- Moderate to severe disease (extensive ulcers, vasculitis): Oral prednisolone combined with dapsone or azathioprine. If the eyes, nervous system, or large vessels are involved, we coordinate with other specialists to start TNF-α inhibitors (infliximab, adalimumab).
- Healing Mucosal Ulcers and Preventing Scars at Haute-Derma:
- Specialized Mouth Rinses and Biological Gels: A mouth rinse containing sucralfate, lidocaine, and dexamethasone relieves pain quickly, protects the mucosa, and speeds up healing of mouth ulcers.
- Cleaning and Healing Genital Ulcers: Ulcers are cleaned with a gentle antiseptic solution and covered with moisture-retaining hydrogel dressings to ease burning pain when urinating.
- Light Therapy and Care for Sensitive Skin:
- Red LED (630 nm) combined with near-infrared LED (830 nm) applied to skin ulcers and erythematous nodules reduces local inflammation and stimulates healthy granulation tissue.
- Gentle skin care advice: avoid unnecessary skin-penetrating procedures (such as microneedling or aggressive micro-injections) while the disease is active, so as not to trigger a pathergy reaction and new lesions.
