Multicentric Reticulohistiocytosis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Multicentric Reticulohistiocytosis?
A rheumatologist usually leads care. A rheumatologist is a doctor who specializes in diseases of the joints, muscles, and immune system. A dermatologist may help with the skin growths, and a surgeon may be consulted in some cases. 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 it is
Multicentric reticulohistiocytosis is a very rare disease. In this condition, certain immune cells build up in the skin, joints, and other parts of the body. These cells are called histiocytes. When too many of them gather in one place, they form small growths. They also cause swelling that can damage the joints over time.
The disease is long lasting, and it affects each person differently. Some people have mainly skin and joint problems. Others also have growths in organs such as the lungs, heart, or digestive tract.
Symptoms
The most common signs show up in the skin and the joints. On the skin, people often develop small, firm bumps. These bumps may look red, purple, or the color of their normal skin. They usually appear on the hands, fingers, face, ears, and around the nails.
Causes and who gets it
The cause of multicentric reticulohistiocytosis is unknown. It is thought to involve the immune system, and it has sometimes been linked to cancers and other diseases in the same patient.
How doctors diagnose it
Doctors examine the skin bumps and joints and may use X-rays or other scans to check the joints and organs. The diagnosis is confirmed with a biopsy, in which a small sample of a bump is examined under a microscope.
Treatment
There is no cure, but medicines that calm the immune system, such as methotrexate or steroids, can help. Treatment focuses on relieving joint pain and slowing joint damage.
When to see a doctor
A person already diagnosed with this disease should contact their doctor if new bumps appear, joint pain gets worse, or trouble breathing, swallowing, or digesting food develops. These changes can mean the disease is affecting organs inside the body.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance for visits. Either one can be a steady partner for someone with a rare disease. They can manage everyday health needs, keep up with medicines, and coordinate care between specialists. They cannot diagnose or treat this rare disease on their own, so they would refer the patient to a rheumatologist, and to a gastroenterologist if digestive symptoms appear. After those visits, the primary care doctor can help carry out the treatment plan and watch for side effects over time.
Common questions
Is multicentric reticulohistiocytosis cancer?
No, it is not cancer. It is an inflammatory condition, which means it involves swelling caused by the immune system. Doctors may still check for other conditions, because some patients have both this disease and certain cancers.
Will the skin bumps go away?
Some bumps shrink with treatment, but others stay or return. Results differ from person to person, so doctors judge progress at follow up visits.
Can it damage my joints permanently?
The disease can wear down joints over time if it is not treated. Early treatment may slow this damage, but how much movement a person keeps varies a lot.
Is it passed down in families?
There is no strong evidence that it runs in families. Most people with the disease have no relatives with it.
Sources
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.
