Reticulohistiocytoma: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Reticulohistiocytoma?
A primary care doctor is often the first to see the bump. A dermatologist, a doctor that specializes in skin conditions, usually confirms the diagnosis and can remove the growth if needed. A pathologist studies the biopsy sample, and most people will not need other specialists.
What it is
A reticulohistiocytoma is a small, harmless growth in the skin made up of immune cells called histiocytes, which normally help fight infection and clean up damaged tissue. When these cells build up in one spot, they form a firm bump. It is not cancer and does not spread.
Symptoms
The main sign is a single, firm bump, usually less than half an inch across. It can be skin colored, pink, red, or slightly yellow brown, and it does not usually hurt or itch. Most appear on the head, neck, or upper body, with no other symptoms.
Causes and who gets it
Doctors do not know exactly what causes a reticulohistiocytoma. It seems to happen when histiocytes gather in one area of skin, but the reason is not clear. It is not contagious and is not caused by poor hygiene. It is rare, reported in children and adults, and may be slightly more common in women.
How doctors diagnose it
A doctor will first examine the bump. Looking at the skin alone is not enough, because several other growths look similar. The usual next step is a skin biopsy, in which a small piece is removed after numbing. A pathologist examines the sample, and certain cell patterns confirm the diagnosis.
Treatment
Because a reticulohistiocytoma is harmless, treatment is often not needed, and some growths go away on their own. If the bump bothers someone, a doctor can remove it with a simple in-office procedure using numbing medicine. Once removed, it rarely comes back.
When to see a doctor
Anyone with a new or changing skin bump should have it checked, since only a biopsy can tell a reticulohistiocytoma apart from similar growths. See a doctor sooner if a bump grows quickly, bleeds, breaks open, changes color, or becomes painful. These signs do not mean cancer, but the bump should be examined.
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 uses insurance. Either can often handle this problem from start to finish, including examining the bump, performing a biopsy, or removing it in the office. If the case is unusual, they will refer the patient to a dermatologist.
Common questions
Is a reticulohistiocytoma cancer?
No. It is a harmless growth that does not spread to other parts of the body. A biopsy is done mainly to rule out other skin conditions that can look similar.
Will the bump go away on its own?
Some reticulohistiocytomas shrink and disappear over time, but this does not happen for everyone. A doctor can explain the options and remove the bump if it bothers the patient.
Does removal hurt?
The area is numbed with medicine before the procedure, so most people feel little more than pressure. Mild soreness afterward is common and usually short lived.
Can it come back after removal?
Recurrence is rare. If a new bump appears, it should be checked by a doctor, since it may be a separate growth.
Sources
- MedlinePlus - Skin Conditions
- NIH Genetic and Rare Diseases Information Center - Reticulohistiocytic granuloma | About the Disease | GARD
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.
