(Anaphylactoid Purpura; HSP; Vascular Purpura)
Henoch-Schonlein purpura (HSP) is
inflammation of the blood vessels in the skin and other body organs. When it involves the skin, it causes a specific rash. The rash looks like bruising or small dots in the skin, referred to as purpura.
HSP is caused by an abnormal reaction of the immune system. Normally, the immune system marks and attacks foreign items like viruses and bacteria. However, with HSP, the immune system attacks the blood vessels. It is not clear why the immune system attacks the body.
The change in the immune system may be triggered by:
- Bacterial or viral infections
- Certain medications
- Recent exposure to certain vaccines
- Infection by insect bites
HSP occurs most often after a respiratory infection. HSP is not contagious.
HSP is most common in children aged 2 to 11 years old, but it can occur at any age.
Factors that increase your risk of HSP include:
Recent upper respiratory illness, such as a
- Recent exposure to vaccines, chemicals, cold weather, or insect bites
Symptoms may last for 4 to 6 weeks and may include:
- Reddish-purple spots that
can be felt and
are not itchy
- Often appears on the buttocks or legs, may appear on the elbows
Red spots of various sizes
- Bruising, usually below the waist
- Pain in the joints, especially knees and ankles
- Abdominal pain
- Blood in the urine
- Swelling of the ankles
- Swelling of the scrotum in males
- Blood in the stool
You will be asked your symptoms and medical history. A physical exam will be done.
Your bodily fluids, tissues, and waste may be tested. This can be done with:
- Blood tests
- Stool sample
from an area of the rash
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HSP usually gets better on its own. Your doctor may prescribe medications if symptoms or complications are causing problems. Medications may include:
Nonsteroidal anti-inflammatory drugs (NSAIDs)—to lessen joint pain and
- Steroid medication—for significant abdominal pain, joint pain, or kidney disease
- Antibiotics—to treat bacterial infection
- Immune system suppressants when you have symptoms of severe kidney disease
There are no guidelines to prevent HSP. Relapse occurs in about half of all cases.
It is important to make sure that you have long-term, follow-up visits with your doctor to be sure that kidney disease doesn't develop.
American Autoimmune Related Diseases Association
Family Doctor—American Academy of Family Physicians
Caring for Kids—Canadian Paediatric Society
College of Family Physicians of Canada
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Accessed June 13, 2016.
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