Meyahealth
HomeGeneticsConditionHarlequin ichthyosis
Back to Condition
Harlequin ichthyosis
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Harlequin ichthyosis

Harlequin ichthyosis is a severe genetic skin disorder that causes infants to be born with thick, diamond-shaped skin plates that disrupt the body's protective barrier.

Overview

Infants with harlequin ichthyosis are born prematurely with hard, thick skin covering most of their bodies. These skin plates are separated by deep cracks, which can affect the shape of the eyelids, nose, mouth, and ears. The condition restricts movement and can cause breathing difficulties due to chest wall restriction. Because the skin cannot function as a normal protective barrier, these infants are at high risk for dehydration and life-threatening infections shortly after birth.

Symptoms

  • Thick skin plates: Large, diamond-shaped plates covering the body at birth.
  • Facial abnormalities: Distorted eyelids, nose, mouth, and ears due to skin tightness.
  • Restricted movement: Difficulty moving limbs and breathing due to skin thickness.
  • Systemic risks: High risk of dehydration, temperature regulation issues, and severe infections.
  • Post-newborn changes: After the initial period, the hard plates are shed, leaving behind widespread scales and redness.

Causes & Risk Factors

The condition is caused by variants in the ABCA12 gene. This gene provides instructions for a protein responsible for transporting lipids (fats) and enzymes in the outermost layer of the skin (the epidermis). When this protein is missing or nonfunctional, the skin cannot develop its protective barrier properly, leading to the severe skin abnormalities observed in affected infants.

Inheritance

Harlequin ichthyosis is inherited in an autosomal recessive pattern. Both copies of the gene in each cell must have variants for the condition to occur. Parents of an affected child are typically carriers and do not exhibit symptoms of the disorder.

Frequently Asked Questions

The baby should be placed in a humidified incubator, covered with a sterile, non‑adhesive dressing to reduce water loss, and given intravenous fluids to prevent dehydration. Early broad‑spectrum antibiotics are started to reduce infection risk, and a pediatric dermatologist is consulted for skin‑softening regimens such as topical retinoids.
With modern neonatal intensive care, aggressive infection control, and early use of oral retinoids, many children survive beyond infancy and can live into their teens or adulthood, although they often have chronic skin issues, growth delays, and increased susceptibility to infections.
Parents can consider preimplantation genetic testing with in‑vitro fertilization to select embryos without two pathogenic ABCA12 variants, use donor gametes, or pursue prenatal diagnostic testing (chorionic villus sampling or amniocentesis) to determine fetal status early in pregnancy.
The thick plates typically begin to soften and shed within the first 2–4 weeks of life. After shedding, the infant will have widespread erythema and fine scaling that may persist for months, requiring ongoing moisturization, gentle cleansing, and monitoring for secondary infections.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

Meyahealth

Ⓒ 2026. All rights reserved by MEYA

About UsTerms & PolicyFAQ