Cutaneous vasculitis is, in simple terms, inflammation of the small blood vessels in the skin. Instead of blood flowing smoothly, inflammation affects these vessels and causes red splotches, bumps and sometimes ulcers. It can be triggered by infections, medications or autoimmune conditions. Sometimes it occurs on its own, but it can also signal a wider problem affecting internal organs, so it is worth taking seriously.

Signs and Symptoms

Cutaneous vasculitis mainly affects small and medium-sized blood vessels in the skin and underlying tissue, producing a range of skin lesions and sometimes general symptoms.

Skin Lesions

• Palpable purpura: raised reddish-purple patches or bumps, often on the legs, buttocks and lower back; can be tender and may scar.
• Petechiae: tiny, flat, non-blanching reddish-brown spots from bleeding under the skin, usually on the lower limbs.
• Urticaria (hives): raised, itchy welts that vary in size and can shift location over time.
• Ulcers: open sores from tissue damage that can be painful, slow to heal and may scar.
• Livedo reticularis: a net-like pattern of reddish-blue discoloration, often on the legs.
• Nodules: firm, raised lumps larger than petechiae or purpura that can be tender and may ulcerate.

General Symptoms

• Fever: common, especially when vasculitis is part of a systemic disease.
• Joint pain (arthralgia): aches and stiffness, particularly in the knees, ankles and wrists.
• Other organ involvement: depending on type and severity, the kidneys, lungs or nervous system can be affected, causing symptoms like blood in the urine, breathing difficulty or neurological problems.

The exact picture depends on the specific type and severity. Some people have only mild skin involvement; others develop more extensive lesions and general symptoms. If you notice new or rapidly worsening signs, see a healthcare professional promptly - early diagnosis and treatment help prevent complications.

Types of Cutaneous Vasculitis

Cutaneous vasculitis is a diverse group of disorders. Classifying them helps guide diagnosis, treatment and understanding of likely outcomes.

1. Capillaritis

Affects the smallest blood vessels, causing palpable purpura, petechiae and sometimes ulcers. Forms include:

• Progressive pigmented purpura: the most common form, often on the lower legs, tends to leave marks.
• Itching purpura: itchy, burning lesions, often triggered by medications or infections.
• Pigmented purpuric lichenoid dermatosis: papules and nodules with purpuric borders, linked to chronic viral infections such as hepatitis C.
• Purpura annularis telangiectodes: ring-shaped lesions with central red spots, sometimes related to autoimmune disease.
• Contact-allergy capillaritis: caused by an allergic reaction to chemicals or metals.
• Lichen aureus: small yellow-red papules, usually on the legs, associated with chronic venous insufficiency.

2. Small Vessel Vasculitis

Affects slightly larger vessels than capillaritis. Types include:

• Hypersensitivity vasculitis: the most common type, often triggered by medications or infections and usually self-limited.
• Henoch-Schönlein purpura: affects children, with joint pain, abdominal pain and kidney involvement alongside skin lesions.
• Acute hemorrhagic edema of infancy: rare, in very young children, with fever, swelling and skin lesions.
• Urticarial vasculitis: wheals with central hemorrhagic spots, linked to infections or autoimmune disease.
• Exercise-induced vasculitis: burning, itching and swelling after exertion.
• Erythema elevatum diutinum: chronic papules and nodules on the hands and forearms.
• Cryoglobulinemia: linked to abnormal blood proteins that precipitate in the cold, with skin lesions, fatigue and joint pain.
• ANCA-associated vasculitis: includes microscopic polyangiitis, eosinophilic granulomatosis with polyangiitis (Churg-Strauss) and granulomatosis with polyangiitis (Wegener's), which can involve the kidneys, lungs and respiratory tract along with the skin.

3. Medium Vessel Vasculitis

Affects medium-sized arteries and veins. The main skin-related form is cutaneous polyarteritis nodosa, which causes nodules and livedo reticularis and can occasionally affect internal organs.

How It Is Diagnosed

Diagnosis involves two goals: excluding other causes and confirming vasculitis.

Excluding Other Causes

A clinical history and physical examination look for triggers such as recent medications, infections or syndromes that mimic vasculitis. Routine tests may include blood work (anemia, platelet count, kidney function, inflammation markers like ESR and CRP), urinalysis (for blood or protein suggesting kidney involvement) and a chest X-ray to rule out lung problems.

Confirming Vasculitis

A skin biopsy is key, ideally within 24-48 hours of a lesion appearing; a deep punch or excision biopsy is preferred. Findings that confirm vasculitis include inflammation within the vessel wall, fibrin deposition, leakage of red blood cells and nuclear debris (leukocytoclasis). Direct immunofluorescence can detect antibody or complement deposits - for example, IgA deposition may suggest kidney, joint or gut involvement, while IgM or IgG may point to cryoglobulinemic vasculitis or rheumatoid arthritis.

Additional Tests

Depending on initial findings, further tests may look for cryoglobulins, ANCA, hepatitis B and C, complement (C3/C4) levels, rheumatoid factor, blood cultures, or abnormal proteins on serum and urine electrophoresis to identify an underlying cause.

Treatment

Treatment depends on the cause, severity and extent of disease.

Addressing the Underlying Cause

If a specific trigger is found - such as hepatitis C driving cryoglobulinemia - treating it may resolve or significantly improve the vasculitis.

Skin-Limited Disease

When confined to the skin with no clear trigger, treatment is usually conservative to control inflammation and ease symptoms. Common options include colchicine, hydroxychloroquine and dapsone (all anti-inflammatory), and short courses of low-dose corticosteroids for quick relief - prolonged steroid use is avoided due to side effects.

More Severe Cases

Extensive disease, ulceration or a need for long-term steroids may call for immunosuppressants such as azathioprine or methotrexate, often combined with the options above.

Supportive Measures

• Wound care: careful cleaning and dressing of ulcers to prevent infection and aid healing.
• Pain management: over-the-counter or prescribed pain relief as needed.
• Sun protection: daily sunscreen can help prevent lesions and scarring from worsening.
• Gentle skincare: mild, fragrance-free products for sensitive skin, along with soothing panthenol and aloe vera, can calm irritated skin, while a basic moisturizer supports the skin barrier.
• Emotional support: living with a chronic condition can be hard, so lean on family, friends or a professional.

Treatment is always individualised, so work with a healthcare professional for diagnosis, treatment choices and monitoring.

The Bottom Line

Cutaneous vasculitis has many possible causes - infections, medications, autoimmune conditions or unknown factors - and ranges from mild rashes to severe ulceration with internal organ involvement. Identifying the trigger is key to management. If you notice suspicious skin lesions or suspect vasculitis, see a doctor for proper diagnosis and personalised guidance.

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