Overview
Isolated congenital anonychia (also called congenital anonychia or anonychia congenita) is a rare condition present from birth in which one or more fingernails or toenails are completely absent. Unlike conditions where nails are simply underdeveloped or malformed, in isolated congenital anonychia the nail plate — the hard part of the nail — is entirely missing from birth. The word 'isolated' means that the missing nails are the main or only feature, without other major birth defects or health problems alongside it. The condition can affect any combination of fingers and toes, and the number of missing nails varies from person to person. Some people are missing just one nail, while others are missing all twenty. The skin where the nail would normally grow may look slightly different, but the fingers and toes themselves are otherwise normally formed. There is no pain directly caused by the absent nails, and internal organs are not affected. Because nails help with fine motor tasks like picking up small objects, gripping, and scratching, their absence can make some everyday activities a little more challenging. Protective coverings or prosthetic nails can help with function and appearance. There is no cure, but the condition does not shorten life expectancy and does not get worse over time. Management focuses on protecting the fingertips and supporting daily activities.
Also known as:
Key symptoms:
Complete absence of one or more fingernails from birthComplete absence of one or more toenails from birthSmooth or slightly thickened skin where the nail would normally beDifficulty picking up small objects due to missing nailsDifficulty with tasks that normally require a nail edge, like scratching or peelingSensitive or exposed fingertip skin where the nail is absentPossible cosmetic concern or self-consciousness about appearance of hands or feet
Autosomal recessive
Passed on when both parents carry the same gene change; often skips generations
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Isolated congenital anonychia.
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Specialists
View all specialists →No specialists are currently listed for Isolated congenital anonychia.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Isolated congenital anonychia.
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Caregiver Resources
NORD Caregiver Resources
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Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.Should we do genetic testing to confirm the RSPO4 gene change, and what does that mean for other family members?,Are there any other health checks we should do to make sure no other conditions are present?,What occupational therapy resources are available to help with fine motor tasks?,Are prosthetic or cosmetic nails a safe and practical option for my child?,What is the risk that future children we have could also be born with this condition?,Are there any clinical trials or research studies we should know about?,How can we best support our child emotionally as they grow up with this condition?
Common questions about Isolated congenital anonychia
What is Isolated congenital anonychia?
Isolated congenital anonychia (also called congenital anonychia or anonychia congenita) is a rare condition present from birth in which one or more fingernails or toenails are completely absent. Unlike conditions where nails are simply underdeveloped or malformed, in isolated congenital anonychia the nail plate — the hard part of the nail — is entirely missing from birth. The word 'isolated' means that the missing nails are the main or only feature, without other major birth defects or health problems alongside it. The condition can affect any combination of fingers and toes, and the number o
How is Isolated congenital anonychia inherited?
Isolated congenital anonychia follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Isolated congenital anonychia typically begin?
Typical onset of Isolated congenital anonychia is neonatal. Age of onset can vary across affected individuals.