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Cutaneous small-vessel vasculitis (CSVV) is among a family of rare diseases characterized by inflammation of the blood vessels, which can restrict blood flow and damage vital organs and tissues. Formerly called hypersensitivity vasculitis, this disorder most commonly affects the skin. It typically occurs in individuals 16 or older. CSVV is also known as leukocytoclastic vasculitis and allergic vasculitis.

Common symptoms of CSVV include a purple or reddish rash over the legs, buttocks or torso, and sometimes the upper body. Hives, blisters, and open sores can also occur. When CSVV is systemic (affecting the whole body), it typically affects the joints, gastrointestinal tract and kidneys. In children, the disease can resemble IgA vasculitis (formerly called Henoch-Schönlein purpura), which also affects the small vessels of the skin and causes a similar rash.

CSVV is often triggered by an allergic reaction to a drug or by an infection, and usually clears up once the offending medication is discontinued or the infection is treated. However, some patients will need corticosteroids used in combination with medications that suppress the immune system, to control inflammation. If there is no organ involvement, most cases go away within weeks to months. However, CSVV can be chronic, with periods of relapse and remission, so ongoing medical care may be necessary.

The exact cause of CSVV is not fully understood by researchers. Vasculitis is classified as an autoimmune disorder—a disease which occurs when the body’s natural defense system mistakenly attacks healthy tissue. CSVV can be caused by an allergic reaction to drugs, such as antibiotics, diuretics and blood pressure medicines, as well as foods or food additives. Other triggers include upper respiratory tract infections, and viruses such as hepatitis B or C, and HIV. Cancer is a rare but possible cause of CSVV.

CSVV can affect individuals with other autoimmune diseases such as rheumatoid arthritis, Crohn’s disease, systemic lupus erythematosus and Sjögren’s syndrome, as well as certain forms of larger-vessel vasculitis.

CSVV can occur at any age, but usually affects individuals over the age of 16. The disease occurs in females and males equally, although some studies indicate it is slightly more common in men. It most often affects Caucasians.

An estimated 38 to 55 per million adults per year are diagnosed with CSVV annually. A 2014 population-based study in Minnesota found the incidence of CSVV in adults to be 45 cases per million. According to studies, CSVV has a reported incidence in Spain of 10 to 30 cases per million people per year.

The hallmark symptom of CSVV is a skin rash, with tender, purple or reddish-brown spots covering large areas—especially the legs, buttocks or torso—or upper body. Other symptoms include blisters, hives and open sores (ulcers) with dead tissue. Crops of lesions typically appear over one or two days, with more appearing over the next days to weeks, until treatment is initiated or the allergy or other trigger goes away. Individual lesions can last up to three weeks and leave scarring, especially if they ulcerate.

There is no single test to diagnose CSVV. Your doctor will likely take a detailed drug history and ask about current medications you’ve been taking, as well as recent infections. A typical exam includes a thorough medical history; a physical examination; blood and urine tests; and specialized imaging studies such as X-rays and computed tomography (CT) scans, when indicated.

A skin biopsy is typically ordered. Biopsy is a surgical procedure that removes a small sample of affected tissue, which is examined under a microscope for signs of inflammation or damage. Usually a biopsy of the skin rash that shows inflammation of the small blood vessels confirms the diagnosis of CSVV.

Treatment of CSVV starts with addressing the suspected trigger. If a drug may have caused the disease, your doctor will probably advise you to discontinue it. If the medication is the culprit, your symptoms should disappear within a few weeks. If an infection is the suspected cause, treating it may resolve symptoms. If the trigger was a food allergy, removing the offending food from the diet may help.

  • Because the legs are commonly affected by rash or joint pain, avoidance of prolonged standing can be helpful, along with elevation of the legs and use of compression stockings.
  • To reduce inflammation in the blood vessels, your doctor may prescribe nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or naproxen, or corticosteroids.
  • In patients with more severe or ongoing skin rashes that are not due to infection, drugs such as colchicine, antihistamines, hydroxychloroquine, and dapsone (or a combination of these drugs) may be helpful to control symptoms.
  • In severe disease, a high-dose steroid may be required. In addition, immunosuppressive drugs such as azathioprine and methotrexate may be prescribed.
  • Patients with disease in organs beyond the skin should be referred to a specialty doctor.

The medications used to treat CSVV have potentially serious side effects, such as lowering your body’s ability to fight infection, and potential bone loss (osteoporosis), among others. Therefore, it’s important to see your doctor for regular checkups. Medications may be prescribed to offset side effects. Infection prevention is also very important. Talk to your doctor about getting a flu shot, pneumonia vaccination, and/or shingles vaccination, which can reduce your risk of infection.

Even with effective treatment, some individuals with CSVV will experience relapses. If your symptoms return or you develop new ones, report them to your doctor as soon as possible. Regular check-ups and ongoing monitoring of lab and imaging tests are important in detecting relapses early.


The best way to manage your disease is to actively partner with your health care providers. Get to know the members of your health care team. It may be helpful to keep a health care journal to track medications, symptoms, test results and notes from doctor appointments in one place. To get the most out of your doctor visits, make a list of questions beforehand and bring along a supportive friend or family member to provide a second set of ears and take notes.

Remember, it’s up to you to be your own advocate. If you have concerns with your treatment plan, speak up. Your doctor may be able to adjust your dosage or offer different treatment options. It is always your right to seek a second opinion.


In general, CSVV patients who primarily have skin and or/joint symptoms have a good outlook, with the disease typically resolving within a few weeks or months. Some develop chronic, recurring disease, which can affect quality of life, and in those cases follow-up medical care is essential.

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