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Epidermolytic ichthyosis
This condition causes the skin's protective barrier to be compromised, resulting in fragile skin that easily blisters and peels. It is present from birth and affects individuals across all ethnic backgrounds, typically following an autosomal dominant inheritance pattern.
Overview
Epidermolytic ichthyosis, sometimes called epidermolytic hyperkeratosis, is a rare genetic disorder affecting the skin [PMID:33671286]. It is one of several conditions classified under the broader term 'ichthyosis', which refers to a group of disorders causing dry, scaly, or thickened skin. Those with epidermolytic ichthyosis have skin that is unusually fragile and prone to blistering, particularly in early life. Over time, the skin can become thickened and scaly, especially in areas subject to friction or pressure.
The condition is present from birth, with symptoms often visible within the first few hours or days of life. The severity can vary significantly among affected individuals, even within the same family [PMID:20301389]. Epidermolytic ichthyosis affects approximately 1 in 200,000 to 300,000 people globally.
Symptoms & clinical features
Newborns with epidermolytic ichthyosis typically present with red, fragile skin and widespread blistering. These blisters can rupture easily, leading to open wounds that are susceptible to infection. The skin may appear raw, similar to a burn. As individuals age, the blistering episodes generally become less frequent, although minor trauma can still cause them.
Over time, the skin tends to become thickened (hyperkeratotic) and scaly, especially in areas like the joints, palms, and soles of the feet [PMID:20301389]. The scales can be dark brown or grey and may have a 'cobblestone' appearance. The thickened skin can also lead to reduced flexibility, making movement difficult in some cases. Sweating may be impaired in affected areas, increasing the risk of overheating.
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Affected organs
Epidermolytic ichthyosis primarily affects the skin, which is the body's largest organ. The structural integrity of the outer layer of the skin (epidermis) is compromised, leading to its characteristic fragility and blistering. While the condition mainly impacts the skin, secondary complications can arise. For example, severe blistering and skin breakdown can increase the risk of skin infections, which may require medical attention.
In some cases, the thickened skin on the palms and soles can affect fine motor skills and walking, but the internal organs are generally not directly affected by epidermolytic ichthyosis.
Risks & severity
The severity of epidermolytic ichthyosis varies considerably, even within a single family. In severe cases, extensive blistering at birth can lead to significant fluid loss and a higher risk of systemic infection, posing a serious threat in the newborn period. Milder forms might involve less widespread blistering and more localised thickened skin. The risk of skin infections remains a concern throughout life due to breaks in the skin barrier.
While blistering tends to improve with age, the thickening and scaling of the skin (hyperkeratosis) typically progress. The lifetime risks associated with epidermolytic ichthyosis are primarily related to chronic skin care, preventing infections, and managing discomfort or restricted movement due to thickened skin. Age of onset is typically at birth or shortly after.
Genetic causes
Epidermolytic ichthyosis is caused by pathogenic variants in the KRT1 or KRT10 genes. These genes provide instructions for making keratin proteins, specifically keratin 1 (KRT1) and keratin 10 (KRT10) [PMID:19366579]. Keratins are a family of tough, fibrous proteins that form the structural framework of skin cells, providing strength and resilience to the epidermis.
Pathogenic variants in KRT1 or KRT10 lead to the production of faulty keratin proteins. These abnormal keratins cannot assemble correctly to form stable networks within skin cells. This structural weakness makes the skin cells fragile and prone to breaking apart with minor friction or trauma, resulting in the characteristic blistering and skin peeling seen in epidermolytic ichthyosis.
- KRT1 keratin 1
- KRT10 keratin 10
Inheritance pattern
Epidermolytic ichthyosis is most often inherited in an autosomal dominant pattern. This means that a person only needs one copy of the altered gene in each cell to develop the condition. In many cases, an affected individual inherits the pathogenic variant from one parent who also has the condition.
However, it is also common for epidermolytic ichthyosis to result from a new (de novo) pathogenic variant in KRT1 or KRT10 that occurs spontaneously during the formation of reproductive cells or in early embryonic development. In such cases, the affected individual's parents do not have the condition. For individuals affected by a de novo variant, there is a low chance of recurrence in future siblings, but they would have a 50% chance of passing the condition on to each of their children.
Each child has a 50% chance of inheriting the pathogenic variant, regardless of sex.
Diagnosis & testing
Diagnosis of epidermolytic ichthyosis is often suspected based on the characteristic skin symptoms at birth, such as widespread redness, blistering, and skin peeling. A skin biopsy can show specific changes under the microscope that are indicative of epidermolytic ichthyosis. This includes clumping of keratin within skin cells (epidermolytic hyperkeratosis).
Confirmation of the diagnosis is typically achieved through genetic testing. This involves specialised tests to look for pathogenic variants in the KRT1 and KRT10 genes. Genetic testing can be accessed through the NHS Genomic Medicine Service, often following referral from a dermatologist or paediatrician to a clinical genetics service. This condition is covered by NHS R-codes for inherited ichthyosis panels, which streamlines the testing process.
Management & lifestyle
While there is currently no cure for epidermolytic ichthyosis, management focuses on reducing symptoms and preventing complications. This typically involves regular skin care to keep the skin moisturised and soft, reduce scaling, and prevent infections. Emollients and moisturising creams are often prescribed to help manage dry skin and reduce the discomfort associated with scaling. Mild antiseptic washes may be used to help prevent bacterial infections in blistered areas.
Individuals with epidermolytic ichthyosis and their families typically receive support from multidisciplinary teams, including dermatologists, genetic counsellors, and specialist nurses. Careful blister care, avoiding trauma, and prompt treatment of skin infections are crucial aspects of ongoing management. Referral to a clinical genetics service can provide a confirmed genetic diagnosis and facilitate genetic counselling to discuss inheritance patterns and family planning.
UK care pathway
For individuals in the UK suspected of having epidermolytic ichthyosis, the care pathway typically begins with a referral to a dermatologist or paediatrician. If a genetic cause is suspected, further referral to a clinical genetics service is usually made. Within the NHS Genomic Medicine Service, genetic testing for inherited ichthyosis conditions, including epidermolytic ichthyosis, is available through specific NHS R-codes. Clinical geneticists and genetic counsellors provide comprehensive support, explaining the condition, its inheritance, and discussing implications for the individual and their family.
Frequently asked questions
Is epidermolytic ichthyosis contagious?
No, epidermolytic ichthyosis is a genetic condition caused by altered genes. It cannot be caught from another person or spread through contact.
Will my children inherit epidermolytic ichthyosis?
If you have epidermolytic ichthyosis, there is generally a 50% chance that each of your children will inherit the condition due to its autosomal dominant inheritance pattern. If your condition is due to a new (de novo) genetic change that only you have, the risk to your future siblings is low, but you would still have a 50% chance of passing it on to your own children. Genetic counselling can provide personalised risk assessments.
Are there any specific activities I should avoid?
Individuals with epidermolytic ichthyosis generally benefit from avoiding activities that could cause significant skin friction or trauma, as this can trigger blistering. It is also important to be mindful of overheating, as impaired sweating in affected skin areas can hinder body temperature regulation. Your healthcare team can offer personalised advice.
What kind of daily care does the skin need?
Daily skin care often involves using specific emollients and moisturisers to keep the skin hydrated and reduce scaling. Gentle cleansing and careful management of any blisters or open wounds are also important to prevent infections. Your dermatologist or specialist nurse will provide a tailored skin care plan.
Can epidermolytic ichthyosis ever be cured?
Currently, there is no cure for epidermolytic ichthyosis, as it is a genetic condition. However, symptoms can be effectively managed with ongoing medical care, specialised skin treatments, and careful attention to preventing complications like infections. Research into potential new therapies is ongoing.
References
- Rice AS, Crane JS. Epidermolytic Hyperkeratosis. 2025. PMID: 31335043
- Notice of withdrawal. The British journal of dermatology. 2020. PMID: 32476153
- Mendes SR, Gameiro AR, Cardoso JC. Mosaic epidermolytic ichthyosis. BMJ case reports. 2021. PMID: 33602779
- Yoneda K, Morita E, Akiyama M. Annular epidermolytic ichthyosis. The British journal of dermatology. 1999. PMID: 10583132
- Knöbel M, O'Toole EA, Smith FJ. Keratins and skin disease. Cell and tissue research. 2015. PMID: 25620412
- Frommherz L, Giehl K, Hofmann J. Epidermolytic ichthyosis: Clinical spectrum and burden of disease in a large German cohort. Journal of the European Academy of Dermatology and Venereology : JEADV. 2025. PMID: 38741524
- Nelson JM, Isaac JM, Mervak JE. Epidermal nevi and epidermolytic hyperkeratosis: A review of cases, highlighting indications for biopsy and genetics referral. Pediatric dermatology. 2024. PMID: 38898621
- Das A, Das A, Bhattacharya S. Superficial epidermolytic ichthyosis. Indian journal of dermatology, venereology and leprology. 2015. PMID: 26515868