National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Ichthyosis is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
Related Disorders List
Information on the following diseases can be found in the Related Disorders section of this report:
- Ichthyosis Congenita (Congenital Ichthyosiform Erythroderma)
- X-linked Ichthyosis
Ichthyosis is a general term for a family of rare genetic skin diseases characterized by dry, thickened, scaling skin. The various forms are distinguished from one another by: 1) extent of the scaling and how widely and where the scaling is scattered over the body; 2) the presence or absence and intensity of reddening of the skin (erythroderma); 3) the mode of inheritance; and 4) the character of associated abnormalities.
Ichthyosis is characterized by scaly and dry skin usually over large areas of the body. The skin may also itch (pruritis) and be red (erythroderma). Babies born with some forms of the disorder may be born covered in a parchment-like membrane called a collodion membrane.
The appearance of the scales may vary; in some forms the scales may be fine and white, while in others the scales may be dark and brown and separated by deep cracks. The more severe forms of ichthyosis can cause other problems. When the skin loses moisture, it becomes dry, tight and inelastic. This rigidity can make moving uncomfortable and can cause the skin to crack and fissure. Thickening of the skin on the soles of the feet can make walking difficult and cracking around the fingers can make even simple tasks painful. In some types of ichthyosis the skin is very fragile and will rub off with the slightest abrasion. Cracks and abrasions then leave the skin open to infection.
Severe scaling on the scalp may interfere with normal hair growth. Thick scales can block pores, making sweating difficult and increasing the risk of overheating. Although the outer skin is thicker in ichthyosis, it is less effective in preventing water and calorie loss by diffusion across the surface of the skin. The rapid turnover of the outer layers of the skin, in some forms of ichthyosis, requires additional energy. Because of greater energy needs, some children with severe ichthyosis may require additional calories to grow normally.
Some people with ichthyosis have trouble closing their eyes completely because the surrounding skin is so tight. This condition, called ectropion, causes the eyelids to flip outward, exposing the red inner lid and causing irritation. If it is left untreated, damage to the cornea may develop leading to impaired vision.
Most known forms of ichthyosis are hereditary disorders. Some forms are caused by dominant genes; some are caused by recessive genes.
In some forms of ichthyosis, the skin cells are produced at the normal rate, but they do not separate normally at the surface of the outermost layer of skin (stratum corneum) and are not shed as quickly as they should be. In other forms, there is an overproduction of skin cells in the epidermis. The cells reach the stratum corneum in as few as four days, compared to the normal fourteen. New cells are made faster than the old cells are shed and build up in the stratum corneum and underlying layers. The result in both instances is a build up of scale.
All the ichthyoses are rare disorders. Incidences vary according to disease type. The ichthyoses occur in all populations. Most forms are not bounded by gender, race or ethnicity.
Ichthyosis congenita (collodion baby; congenital ichthyosiform erythroderma; xeroderma; desquamation of the newborn) is an inherited skin disorder. It is characterized by generalized, abnormally red, dry, and rough skin with large coarse and fine white scales. Itchiness (pruritus) usually also develops. Skin on the palms of the hands and soles of the feet can be abnormally thick. (For more information, choose "Ichthyosis Congenita" as your search term in the Rare Disease Database.)
X-linked ichthyosis is an inherited skin disorder that affects males. It is caused by a deficiency of the enzyme steroid sulfatase. It is characterized by brownish scales on the back of the neck, back and legs.
The dry skin of ichthyosis is treating by applying skin softening emollients. This can be particularly effective after bathing while the skin is still moist. Lotions containing alpha-hydroxy acids, urea, or propylene glycol can also be effective. Skin barrier repair formulas containing ceramides or cholesterol may also improve scaling.
Severe cases of ichthyosis may be treated systemically with oral synthetic retinoids (synthetic derivatives of Vitamin A). Retinoids are used only in severe cases due to their known bone toxicity and other complications.
Information on current clinical trials is posted on the Internet at www.clinicaltrials.gov. All studies receiving U.S. government funding, and some supported by private industry, are posted on this government website.
For information about clinical trials being conducted at the National Institutes of Health (NIH) Clinical Center in Bethesda, MD, contact the NIH Patient Recruitment Office:
Tollfree: (800) 411-1222
TTY: (866) 411-1010
For information about clinical trials sponsored by private sources, contact:
Elias, PM, Williams, ML. Enlightened Therapy of the Disorders of Cornification. Clinics in Dermatology. 2003; 21: 269-273.
DiGiovanna, JJ, Robinson-Bostom, L. Ichthyosis: etiology, diagnosis, and management. Am J Clin Dermatol. 2003; 4: 81-95.
Williams, ML, et al. Genetically Transmitted, Generalized Disorders of Cornification. The Ichthyoses. Dermatol Clin. January 1987; 5(1): 155-78.
Foundation for Ichthyosis & Related Skin Types
2616 N Broad Street
Colmar, PA 18915
NIH/National Institute of Arthritis and Musculoskeletal and Skin Diseases
One AMS Circle
Bethesda, MD 20892-3675
National Registry for Ichthyosis and Related Disorders
University of Washington
Dermatology Dept. Box 356524
1959 N.E. Pacific Street
Seattle, WA 98195-6524
Cicatricial Alopecia Research Foundation
330 W State Street
Geneva, IL 60134
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
PO Box 241956
Los Angeles, CA 90024
European Network for Ichthyosis (ENI)
In den Dellen 21
Tel: +49 2207849869
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It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report
This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.
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Last Updated: 4/19/2008
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