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Living with Ablepharon macrostomia syndrome

A rare genetic condition with absent eyelids, a very large mouth, and differences in the skin, hair, ears, and hands.

Understanding Ablepharon macrostomia syndrome

Ablepharon macrostomia syndrome is a genetic disorder with absent eyelids (ablepharon) and a very large mouth (macrostomia).

Other common features include differently shaped ears, fused fingers and toes, dry coarse skin, absent or sparse hair, genital differences, and developmental delay. It belongs to a group called ectodermal dysplasias, which affect the skin, hair, nails, sweat glands, or teeth. GARD lists onset as during pregnancy and as a newborn.

Signs & symptoms

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

  • Absent eyelids (ablepharon)
  • Absent eyebrows and eyelashes
  • Dry, wrinkled skin
  • Global developmental delay
  • Hearing impairment
  • Genital differences

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 brain and nervous system specialists, ear, nose, and throat specialists, eye disease specialists and genetic specialists.

  3. Consider genetic testing

    Changes in TWIST2 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    World Craniofacial Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Ear, nose, and throat specialists (otolaryngologists); Eye disease specialists (ophthalmologists); Genetic specialists (geneticists)
Expert care
Expert lists: World Craniofacial Foundation
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 World Craniofacial Foundation and other patient organizations
  • 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
Which eye specialists should care for protecting the eyes?
Should my child have hearing and speech evaluations?
What does TWIST2 genetic testing mean for our family?

Quick facts

Symptoms usually startduring Pregnancy and as a Newborn
InheritanceAutosomal Dominant
GenesTWIST2

Changes in the TWIST2 gene cause this condition. It is autosomal dominant, but most cases are sporadic, with no other cases in the family.

GeneticNeurological

Also known as: ablepharon-macrostomia syndrome; ams

Patient organizations

Source: NIH GARD · Ablepharon macrostomia syndromeGARD ID 3 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Ablepharon macrostomia syndrome.

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