Congenital Generalized Fibromatosis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Congenital Generalized Fibromatosis?
A pediatrician or family doctor usually refers the family to specialists, which may include a dermatologist, a pediatric surgeon, or other experts when organs are involved. 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
Congenital generalized fibromatosis is a very rare condition in which babies are born with many small growths called fibromas, lumps made of fibrous tissue. The growths are not cancer and can appear in the skin, fat, muscles, and sometimes internal organs.
Doctors sometimes call this condition infantile myofibromatosis. Many growths shrink on their own in the first few years of life, but growths affecting organs can be more serious.
Symptoms
The most common sign is one or more firm, round lumps under the skin. They may be purple, red, or skin-colored, and they usually do not hurt.
Growths inside the body may cause no visible signs. Depending on where they are, a baby may have trouble breathing, poor feeding, vomiting, or a swollen belly, which is why imaging tests are important.
Causes and who gets it
The condition is caused by mutations in certain genes, most often the PDGFRB gene. Some cases run in families, but many happen for the first time in a baby with no family history.
The changed gene makes certain cells multiply more than they should, forming fibromas. Because the growths are present before birth, they are called congenital.
How doctors diagnose it
A doctor examines the lumps and asks about family history. Ultrasound, MRI, or CT scans show whether growths are inside the body, and a biopsy or genetic testing can confirm the diagnosis.
Treatment
When growths are only in the skin, doctors often use watchful waiting, because many lumps shrink on their own. Growths pressing on organs may be treated with surgery or chemotherapy drugs.
When to see a doctor
Any baby with a new lump under the skin should be seen by a doctor. Seek care quickly for trouble breathing, trouble feeding, vomiting, or a lump that grows fast.
How a direct primary care or concierge doctor fits in
A direct primary care doctor is paid a flat monthly fee instead of billing insurance per visit, while a concierge doctor usually charges more and often works alongside insurance. Either can spend extra time on rare conditions, examining lumps, ordering imaging, and coordinating specialist appointments, and may manage watchful waiting directly when growths are only in the skin.
Common questions
Is congenital generalized fibromatosis cancer?
No. The growths are benign, which means they are not cancer and do not spread the way cancer does. Still, growths inside organs can cause serious problems, so doctors check carefully.
Will the lumps go away on their own?
Often they shrink during early childhood, but this does not happen for every child. Some lumps stay, and some come back after shrinking. Regular follow-up helps doctors track what is happening.
Can my other children get it?
If a parent carries the changed gene, each child has a chance of inheriting it. Many cases appear with no family history at all. A genetic counselor can help families understand their specific situation.
Can adults get fibromas like these?
Adults can develop single fibromas in the skin, but congenital generalized fibromatosis itself starts before or shortly after birth. Any adult with a new lump should still have it checked by a doctor.
Sources
- NIH Genetic and Rare Diseases Information Center - Infantile myofibromatosis
- MedlinePlus - Skin Conditions
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.
