Hypersensitivity Vasculitis: Causes, Symptoms, and Treatment
Written by Harsha Moole, MD. Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Hypersensitivity Vasculitis?
A dermatologist (a skin doctor) or a rheumatologist (a doctor for immune diseases) usually treats it. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is hypersensitivity vasculitis?
This is an extreme reaction to a medicine, infection, or foreign substance. It leads to swelling and damage in blood vessels, mainly in the skin. The medical word for this swelling is inflammation. In vasculitis, the immune system attacks a blood vessel by mistake.
MedlinePlus says this term is not used much now. More specific names are considered more precise. Other names are allergic vasculitis, leukocytoclastic vasculitis, and cutaneous small vessel vasculitis.
Symptoms
Symptoms may include:
- A new rash with tender, purple or brownish-red spots.
- Skin sores, mostly on the legs, buttocks, or trunk.
- Blisters on the skin.
- Hives, which may last longer than 24 hours.
- Open sores with dead tissue.
Vasculitis in general often causes fever, swelling, and feeling ill.
Causes and who gets it
It is caused by an allergic reaction to a medicine or other foreign substance. It can also be caused by a reaction to an infection. It usually affects people older than age 16. Often the cause cannot be found, even after a careful look at the history.
It may look like a form of vasculitis that harms blood vessels all over the body. In children, it can look like Henoch-Schonlein purpura. Vasculitis in general can be set off by infections, trauma, some drugs, and autoimmune disorders.
How doctors diagnose it
Diagnosis is based on symptoms. The provider reviews the medicines you have taken and any recent infections. You will be asked about cough, fever, or chest pain. You will also have a full physical exam. Blood and urine tests may look for other body-wide disorders such as lupus or hepatitis C. Blood tests may include a complete blood count and tests for inflammation.
A skin biopsy (a small skin sample checked in a lab) shows swelling in the small blood vessels.
Treatment
The goal of treatment is to reduce inflammation. You may be given aspirin, NSAIDs (anti-inflammatory pain medicines), or corticosteroids. Do not give aspirin to children except as advised by your provider. You will be told to stop any medicine that could be the cause.
It most often goes away over time, but it may come back in some people. People with ongoing vasculitis should be checked for systemic vasculitis, which affects the whole body. Complications may include lasting damage and scars. Inflamed vessels can also affect the organs inside the body.
When to see a doctor
Contact your provider if you have symptoms of hypersensitivity vasculitis. Do not take medicines that have caused an allergic reaction in the past.
Call 911 or go to the emergency room if you have severe trouble breathing, chest pain or discomfort for two minutes or more, fainting, a sudden change in mental state, or bleeding that will not stop.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. This kind of doctor can review your medicines and order first blood and urine tests. They can also help you reach a dermatologist or rheumatologist. Follow-up visits can show if the rash comes back.
Common questions
Is hypersensitivity vasculitis serious?
It depends. It most often goes away over time, but it can come back in some people. Complications can include scarring and inflamed blood vessels affecting the internal organs.
What triggers hypersensitivity vasculitis?
An allergic reaction to a medicine or other foreign substance can trigger it. So can a reaction to an infection. Often the cause cannot be found.
Is hypersensitivity vasculitis the same as leukocytoclastic vasculitis?
Yes, they are two names for the same condition. It is also called allergic vasculitis and cutaneous vasculitis.
Can hypersensitivity vasculitis be prevented?
Not always, because the cause is often not found. One step helps. Do not take medicines that have caused an allergic reaction in the past.
Sources
- MedlinePlus - Hypersensitivity vasculitis
- MedlinePlus - Vasculitis
- National Heart, Lung, and Blood Institute - Vasculitis
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
