Linear Nevus Sebaceous Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Linear Nevus Sebaceous Syndrome?
A dermatologist, a doctor who treats skin conditions, often cares for the skin patches. If the brain, eyes, or bones are involved, a team is needed. It can include a pediatric neurologist, a brain and nerve doctor for children, and an ophthalmologist, an eye doctor. 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 linear nevus sebaceous syndrome?
Linear nevus sebaceous syndrome is a rare disorder that affects many parts of the body. It is also called nevus sebaceus syndrome or Schimmelpenning syndrome. Nevus sebaceus syndrome is now the preferred term.
The main sign is a sebaceous nevus, which is a birthmark. It is made of extra, oddly shaped oil glands in the skin. These patches often follow lines on the skin. The syndrome also includes problems in other organs, most often the brain, eyes, and bones. Less often it affects hormones, the heart, and the kidneys.
Symptoms
Symptoms and severity vary a lot from person to person. Not everyone has every symptom. Skin signs include:
- Salmon-colored or yellowish, hairless, smooth patches, most often on the scalp, face, or neck.
- Patches that become more noticeable around puberty and may look scaly, warty, or thick.
- Areas of hair loss when the scalp is involved.
Other symptoms depend on which organs are involved:
- Brain and nerves: seizures, delays in reaching milestones, and trouble with learning and thinking.
- Eyes: a coloboma, which is a missing piece of tissue in the iris or the retina, clouding of the cornea, crossed eyes, or optic nerve defects.
- Bones: a curved spine, a dislocated hip, or limb deformities.
- Rickets that does not respond to vitamin D, with bowed legs, leg pain, and soft bones. Broken bones may be more likely.
After puberty, growths can form inside a sebaceous nevus. Most of these growths are benign, which means they are not cancer.
Causes and who gets it
The syndrome is caused by changes in the KRAS and HRAS genes. These changes are not inherited. They happen after the egg is fertilized, while the baby is forming. They are found in only some of the body's cells, a pattern called mosaic.
The earlier in development the change happens, the wider the nevus will be. Other organs are also more likely to be involved. The syndrome affects males and females equally. The patches are usually present at birth, but they may not be noticed until later in childhood or after puberty.
How doctors diagnose it
Doctors diagnose it from the signs. They look for a sebaceous nevus along with problems in other organ systems. A detailed history and a full exam are key. A skin biopsy, which is a small skin sample looked at under a microscope, may be done.
Other tests may look for related problems. These can include a skeletal survey, a full eye exam, chest x-rays, and brain imaging with CT or MRI scans. Doctors disagree about whether a child with only a skin patch needs brain imaging. Some researchers think it should be avoided unless there are signs that the nervous system is involved.
Treatment
Treatment targets the symptoms each person has. It often takes a team of specialists. For example, seizures may be treated with anti-seizure medicines. Some bone and eye problems may be treated with surgery.
Surgery on the skin patch may be done to change how it looks. In the past, surgery was advised because of cancer risk. The risk is much lower than once thought, so this is no longer recommended, especially if surgery would be disfiguring. Removal leaves a scar, and it is not always possible because of where the nevus is.
Laser therapy and other methods that destroy skin have been suggested for looks only. Weaker versions often do not remove the cells that cause the nevus, so it can grow back. Stronger versions may stop it from returning, but they cause scarring.
When to see a doctor
Have a doctor check any sebaceous nevus, or a similar birthmark, in a child. The syndrome can affect the brain, eyes, and bones, so a full check may be needed. People with the syndrome need a coordinated team when several organs are involved.
Call 911 or go to the emergency room if a child has trouble or abnormal breathing, bluish or grey skin, or is unconscious.
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 can help spot the need for a specialist early and keep track of care from several doctors over time.
Common questions
Is linear nevus sebaceous syndrome inherited?
It is unlikely to be inherited. The gene changes happen by chance after fertilization, and they are not passed down in the usual way. Genetic counseling may still help affected people and their families.
Does a sebaceous nevus turn into skin cancer?
Rarely. Growths can form inside a sebaceous nevus after puberty, but most are benign. Cancers linked to a sebaceous nevus are very rare.
Does everyone with a sebaceous nevus have the syndrome?
No. A sebaceous nevus often occurs alone. The term syndrome is used when there are also symptoms in organs other than the skin.
Does a sebaceous nevus always need to be removed?
No. Surgery was once advised because of cancer risk, but the risk is much lower than first thought. Removal is mainly for appearance and leaves a scar.
Sources
- National Organization for Rare Disorders (NORD) - Nevus Sebaceus Syndrome
- National Organization for Rare Disorders (NORD) - Epidermal Nevus Syndromes
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.
