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Living with Nonsyndromic congenital nail disorder 7

A rare condition affecting the nails and sometimes the bones of the fingers or toes, usually the index fingers.

Understanding Nonsyndromic congenital nail disorder 7

Nonsyndromic congenital nail disorder 7 is a rare condition present at birth in which nails form abnormally, often on the index fingers.

Nails can be small, narrow, missing, overgrown, or misaligned on one or both sides of the body. They often involve the index fingers, other fingers, or toes. The bones of the affected fingers or toes can also differ. It can be sporadic or run in families. GARD lists onset as newborn.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Poorly formed fingernails and toenails
  • Small or narrow nails
  • Notched (split) nails
  • Overgrown, curving nails (onychogryphosis)
  • Missing half-moon at the base of the nail (lunula)
  • Bone differences in the tip of the index finger

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include genetic specialists and skin, hair, and nail specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Genetic specialists (geneticists); Skin, hair, and nail specialists (dermatologists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Children's Skin Disease Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should the bones of the affected fingers or toes be checked with imaging?
Would genetic testing be useful for our family?
Can the nails be cared for or treated to prevent pain or ingrowth?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Dominant

GARD says changes in genes cause this condition. It is inherited in an autosomal dominant way, meaning one changed copy of the gene can be enough.

GeneticSkin

Also known as: coif; coif syndrome; congenital isolated onychodysplasia; congenital onychodysplasia of the index fingers; iso-kikuchi syndrome; isolated congenital onychodysplasia

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Nonsyndromic congenital nail disorder 7GARD ID 9761 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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