Hypersensitivity vasculitis
Cutaneous small vessel vasculitis; Allergic vasculitis; Leukocytoclastic vasculitisHypersensitivity vasculitis is an extreme reaction to a drug, infection, or foreign substance. It leads to inflammation and damage to blood vessels, mainly in the skin. The term is not used much currently because more specific names are considered more precise.
Causes
Hypersensitivity vasculitis, or cutaneous small vessel vasculitis, is caused by:
- An allergic reaction to a drug or other foreign substance
Allergic reaction
Allergic reactions are sensitivities to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, and gastroin...
ImageRead Article Now Book Mark Article - A reaction to an infection
It usually affects people older than age 16.
Often, the cause of the problem cannot be found even with a careful study of the person's medical history.
Hypersensitivity vasculitis may look like systemic, necrotizing vasculitis, which can affect blood vessels throughout the body and not just in the skin. In children, it can look like Henoch-Schonlein purpura.
Necrotizing vasculitis
Necrotizing vasculitis is a group of disorders that involve inflammation of the blood vessel walls. The size of the affected blood vessels helps to ...
Symptoms
Symptoms may include:
- New rash with tender, purple or brownish-red spots over large areas
- Skin sores mostly located on the legs, buttocks, or trunk
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Blisters on the skin
Blisters
A vesicle is a small fluid-filled blister on the skin.
ImageRead Article Now Book Mark Article - Hives (urticaria), may last longer than 24 hours
Urticaria
Hives are raised, often itchy, red bumps (welts) on the surface of the skin. They can be an allergic reaction to food or medicine. They can also ap...
ImageRead Article Now Book Mark Article - Open sores with dead tissue (necrotic ulcers)
Ulcers
An ulcer is a crater-like sore on the skin or mucous membrane. Ulcers form when the top layers of skin or tissue have been removed. They can occur ...
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Exams and Tests
The health care provider will base the diagnosis on symptoms. The provider will review any medicines or drugs you have taken and recent infections. You will be asked about cough, fever, or chest pain.
A complete physical exam will be done.
Blood and urine tests may be done to look for systemic disorders such systemic lupus erythematosus, dermatomyositis, or hepatitis C. The blood tests may include:
- Complete blood count with differential
- C-reactive protein
- Erythrocyte sedimentation rate
- Chemistry panel with liver enzymes and creatinine
- Antinuclear antibody (ANA)
- Rheumatoid factor
- Antineutrophil cytoplasmic antibodies (ANCA)
- Complement levels
- Cryoglobulins
- Hepatitis B and C tests
- HIV test
- Urinalysis
Skin biopsy shows inflammation of the small blood vessels.
Skin biopsy
A skin lesion biopsy is when a small amount of skin is removed so it can be examined under a microscope. The skin is tested to look for skin conditi...
Treatment
The goal of treatment is to reduce inflammation.
Your provider may prescribe aspirin, nonsteroidal anti-inflammatory drugs (NSAIDs), or corticosteroids to reduce inflammation of the blood vessels. (Do not give aspirin to children except as advised by your provider).
Your provider will tell you to stop taking medicines that could be causing this condition.
Outlook (Prognosis)
Hypersensitivity vasculitis most often goes away over time. The condition may come back in some people.
People with ongoing vasculitis should be checked for systemic vasculitis.
Possible Complications
Complications may include:
- Lasting damage to the blood vessels or skin with scarring
- Inflamed blood vessels affecting the internal organs
When to Contact a Medical Professional
Contact your provider if you have symptoms of hypersensitivity vasculitis.
Prevention
Do not take medicines that have caused an allergic reaction in the past.
References
Dinulos JGH. Hypersensitivity syndromes and vasculitis. In: Dinulos JGH, ed. Habif's Clinical Dermatology. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 18.
Jennette JC, Falk RJ, Bacon PA, et al. 2012 revised International Chapel Hill consensus conference nomenclature of vasculitides. Arthritis Rheum. 2013;65(1):1-11. PMID: 23045170 pubmed.ncbi.nlm.nih.gov/23045170/.
Patterson JW. The vasculopathic reaction pattern. In: Patterson JW, ed. Weedon's Skin Pathology. 5th ed. Philadelphia, PA: Elsevier; 2021:chap 9.
Stone JH. The systemic vasculitides. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 254.
Sunderkötter CH, Zelger B, Chen KR, et al. Nomenclature of cutaneous vasculitis: dermatologic addendum to the 2012 Revised International Chapel Hill Consensus Conference Nomenclature of Vasculitides. Arthritis Rheumatol. 2018;70(2):171-184. PMID: 29136340 pubmed.ncbi.nlm.nih.gov/29136340/.
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Vasculitis on the palm - illustration
These spots of blood under the skin, called purpura, are caused by vasculitis. They do not turn white with pressure (non-blanchable). In this particular case, the purpura are associated with an underlying disorder affecting the structure of the blood vessel walls called collagen-vascular disorder.
Vasculitis on the palm
illustration
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Vasculitis - illustration
Inflammation of the blood vessels (vasculitis) may be caused when antibodies that have attached to antigens in the blood (immune complexes) attach to the blood vessel walls. These purplish spots can be felt in the skin. They do not turn white (blanch) when pressed. As the condition progresses, they may become larger and more bruise-like (ecchymotic), and some may develop central ulceration or necrosis (tissue death).
Vasculitis
illustration
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Vasculitis - urticarial on the hand - illustration
These red (erythematous), hive-like (urticarial) spots (plaques) are caused by inflammation of the blood vessels (urticarial vasculitis) and do not change over a 24-hour period. They may or may not turn white (blanch) with pressure.
Vasculitis - urticarial on the hand
illustration
-
Vasculitis on the palm - illustration
These spots of blood under the skin, called purpura, are caused by vasculitis. They do not turn white with pressure (non-blanchable). In this particular case, the purpura are associated with an underlying disorder affecting the structure of the blood vessel walls called collagen-vascular disorder.
Vasculitis on the palm
illustration
-
Vasculitis - illustration
Inflammation of the blood vessels (vasculitis) may be caused when antibodies that have attached to antigens in the blood (immune complexes) attach to the blood vessel walls. These purplish spots can be felt in the skin. They do not turn white (blanch) when pressed. As the condition progresses, they may become larger and more bruise-like (ecchymotic), and some may develop central ulceration or necrosis (tissue death).
Vasculitis
illustration
-
Vasculitis - urticarial on the hand - illustration
These red (erythematous), hive-like (urticarial) spots (plaques) are caused by inflammation of the blood vessels (urticarial vasculitis) and do not change over a 24-hour period. They may or may not turn white (blanch) with pressure.
Vasculitis - urticarial on the hand
illustration
Review Date: 4/30/2023
Reviewed By: Neil J. Gonter, MD, Assistant Professor of Medicine, Columbia University, New York, NY, and private practice specializing in Rheumatology at Rheumatology Associates of North Jersey, Teaneck, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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