Pachyonychia Congenita: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Pachyonychia Congenita?
A dermatologist, a doctor who treats skin, hair, and nails, usually leads care for pachyonychia congenita. A geneticist, a doctor who studies inherited conditions, can help explain the cause. 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 pachyonychia congenita?
Pachyonychia congenita is a condition that mainly affects the skin and nails. It is a very rare disorder. The signs usually become clear within the first few years of life.
Researchers used to sort it into two types, called PC-1 and PC-2. Now it is sorted into five types, based on which gene is altered.
Symptoms
Symptoms and how severe they are can differ a lot, even among people in the same family. Common signs include:
- Very painful calluses on the soles of the feet. Almost everyone with this condition has them.
- The calluses usually start in childhood, when kids first start to walk, and can make walking painful or impossible.
- Blisters under the calluses, which cause extreme pain.
- Thick, oddly shaped fingernails and toenails. Most people have some nail changes.
- Thick skin on the palms of the hands, which can be painful.
- Thick, white patches on the tongue and inside of the cheeks.
- Bumps around hair follicles, the tiny pockets that hold hairs, on the elbows, knees, and waistline.
- Cysts, which are small closed sacs, in the armpits, groin, back, or scalp.
- Heavy sweating on the palms and soles.
Some babies have teeth that are already present at birth or in early infancy. Some babies and children have ear pain when they begin to eat or drink. The voice box can also be affected, which can cause hoarseness or breathing problems. Infections can happen under the nails and can be painful.
Causes and who gets it
Changes in one of five genes cause pachyonychia congenita. They are called KRT6A, KRT6B, KRT6C, KRT16, and KRT17. These genes make keratins, which are tough proteins that give strength to the skin, hair, and nails. When the keratins are changed, skin cells become fragile and are easily damaged. Normal activities such as standing and walking can then cause painful blisters and calluses.
The condition is autosomal dominant, which means one changed copy of the gene in each cell is enough to cause it. In about 60 to 70 percent of cases, the person inherits the change from one affected parent. In 30 to 40 percent of cases, the change is new, which means it was not passed down from a parent.
How doctors diagnose it
Doctors usually diagnose pachyonychia congenita by examining the person. A gene test can confirm the diagnosis. It uses a sample of blood or saliva to find the exact gene change. The white patches in the mouth can be mistaken for a yeast infection called Candida if no other signs are noticed.
Treatment
NORD reports that there is no cure or specific treatment for pachyonychia congenita at present. People manage their symptoms at home or with professional care. Care can include:
- Trimming, filing, or grinding the calluses, and filing or clipping thick nails.
- Moisturizers and creams that soften skin, such as ones with salicylic acid or urea. They give limited benefit.
- Retinoids, which are vitamin A-type medicines. They can help thin a callus, but they may lead to more pain.
- Shots of botulinum toxin into the sole. A small number of patients have had less pain and blistering this way.
- Draining or removing cysts that are infected or painful. Cysts do not usually need treatment otherwise.
- Wicking socks and ventilated shoes for heavy sweating.
- A soft bottle nipple with a larger opening for young infants who have mouth patches and are not gaining weight.
When to see a doctor
See a doctor if you or your child has very painful calluses on the feet or thick, misshapen nails, because both are common in this condition. Also get care for a hoarse voice or for any breathing problems. A painful nail also needs a visit, because infections can happen under the nails. Call 911 or go to the emergency room if you or your child has severe difficulty breathing.
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 start an evaluation, keep track of your care over time, and help coordinate care with a dermatologist or geneticist.
Common questions
Is pachyonychia congenita inherited?
Yes, it is an inherited condition. One changed copy of a gene is enough to cause it, and each pregnancy has a 50 percent chance of passing it on from an affected parent.
Can pachyonychia congenita be cured?
No cure has been found, according to NORD. Care focuses on easing symptoms such as painful calluses, thick nails, and heavy sweating.
Why do the calluses hurt so much?
They hurt because blisters form under the calluses. Changed keratin makes the skin fragile, so standing and walking damage it.
Does pachyonychia congenita affect the mouth and voice?
Yes, it can affect both. It can cause thick, white patches inside the mouth, and it can cause hoarseness in some people.
Sources
- MedlinePlus Genetics - Pachyonychia congenita
- National Organization for Rare Disorders (NORD) - Pachyonychia Congenita
- NIH Genetic and Rare Diseases Information Center - Pachyonychia congenita syndrome
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.
