Blue Rubber Bleb Nevus Syndrome: Causes, Symptoms, and Treatment

Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.

What kind of doctor treats Blue Rubber Bleb Nevus Syndrome?

A dermatologist, a doctor who treats skin conditions, and a gastroenterologist, a doctor who treats the digestive tract, usually care for people with blue rubber bleb nevus syndrome. A hematologist, a doctor who treats blood disorders, may also help. 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 Blue Rubber Bleb Nevus Syndrome?

Blue rubber bleb nevus syndrome, also called Bean syndrome, is a rare vascular disorder. It causes many venous malformations. These are abnormally formed veins. They appear in the skin and the gastrointestinal tract. Lesions can also show up in the liver, spleen, heart, eyes, and central nervous system. Most cases happen by chance, with no family history.

The malformations are dilated, thin-walled veins. Dilated means widened. These veins did not form the right way. They tend to grow and bleed over time. Slow blood flow inside them can lead to clots. The disease course is usually chronic. That means it lasts a long time.

Symptoms

Signs often start at birth or in early childhood. They include:

  • Blue to purple, soft, rubbery skin lumps. You can press them flat. They grow or increase in number with age.
  • Belly pain and black, tarry stools, called melena.
  • Fatigue, weakness, and pale skin, called pallor, from long-term blood loss.
  • Blood visible in the stool, called hematochezia.

Many patients develop chronic gastrointestinal bleeding. This is long-term bleeding in the gut. It can lead to iron deficiency anemia, a low red blood cell count. In severe cases, people may need repeated blood transfusions. Some patients feel tenderness or pain in the skin lesions, especially at night.

Causes and who gets it

This syndrome is linked to changes in the TEK gene. The changes are somatic. That means they happen in some body cells but are not passed down from a parent. They turn the TEK gene on when it should be off. This disrupts blood vessel growth and leads to abnormal veins. Most cases are sporadic, meaning they happen by chance. Rare familial cases have also been described.

How doctors diagnose it

Doctors diagnose this syndrome mostly from the clinical exam. They look for the typical blue skin lesions. Lab tests include a complete blood count. Iron studies check for iron deficiency anemia. D-dimer and fibrinogen are blood tests that may show a clotting problem linked to venous malformations.

Endoscopy is the gold standard for checking the gut. It uses a flexible tube with a camera. Upper endoscopy and colonoscopy look at the upper and lower digestive tract. Capsule endoscopy uses a small camera you swallow. It is often used to find small bowel lesions, the most common source of gut disease. Ultrasound helps at first. Contrast-enhanced MRI is a scan that shows how deep lesions go and where they spread. Genetic testing for TEK changes can support the diagnosis.

Treatment

Treatment is mainly supportive and aims to reduce problems from bleeding. Care usually includes:

  • Iron supplements and blood transfusions to manage chronic iron deficiency anemia.
  • Endoscopic therapy for gut lesions doctors can reach. It is generally considered the first-line treatment, the one doctors try first. Techniques include sclerotherapy, which injects medicine to shrink a lesion, plus band ligation, laser therapy, and argon plasma coagulation. More than one session is often needed. Bleeding can come back.
  • Sirolimus, a medicine taken by mouth, for people with widespread disease. Studies show it can shrink lesions, improve hemoglobin levels, and lower transfusion needs. Hemoglobin is the protein that carries oxygen in red blood cells. Bleeding or lesions can return after stopping it.
  • Surgery for severe disease in one area, or for life-threatening problems. Examples are bleeding that will not stop or a blocked bowel.

Care usually involves several specialties working together. These include gastroenterology, dermatology, and hematology.

When to see a doctor

Tell your doctor about warning signs such as blood in your stool, black tarry stools, belly pain, or changes in bowel habits. These symptoms may indicate active bleeding or complications, such as intussusception, a folded bowel. Regular follow-up and laboratory monitoring are important.

Call 911 or go to the emergency room for bleeding that will not stop, vomiting blood, fainting, severe belly pain, or trouble breathing. Heavy bleeding or a blocked bowel can be life threatening.

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. Either type can help arrange regular follow-up, laboratory monitoring, and surveillance imaging or endoscopy when needed. They can also coordinate long-term interprofessional care.

Common questions

Is Blue Rubber Bleb Nevus Syndrome dangerous?

It can be serious, mostly because of ongoing gut bleeding that causes anemia. But the outlook is generally favorable. Many patients have a normal life expectancy when problems are recognized and managed. Serious problems like massive bleeding are relatively uncommon with monitoring and treatment.

Can Blue Rubber Bleb Nevus Syndrome be prevented?

No. It happens by chance from gene changes that are not passed down from a parent.

Do the skin lesions hurt?

Some do. People may feel tenderness or pain in the lesions, especially at night. Clots inside the malformations can also cause pain.

What is the medicine sirolimus?

Sirolimus is a medicine that blocks a growth pathway in cells, the mTOR pathway. In studies, it reduced lesion size, improved hemoglobin levels, and lowered transfusion needs in people with widespread disease. Dosing varies, and long-term treatment may be needed.

Sources

  1. NCBI Bookshelf - Blue Rubber Bleb Nevus Syndrome
  2. MedlinePlus Genetics - Multiple cutaneous and mucosal venous malformations

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.