MSD Manual

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James G. H. Dinulos

, MD, Geisel School of Medicine at Dartmouth

Reviewed/Revised May 2023
Topic Resources

Ichthyosis is scaling and flaking of the skin that ranges from mild but annoying dryness to severe and disfiguring skin disease.

Ichthyosis is a form of severe dry skin. Ichthyosis causes scale to form on the skin in excessive amounts. Scale is areas of heaped-up, dead skin cells that appear as flaky, dry, rough patches.

Unlike xeroderma Dry Skin (Xeroderma) Xeroderma is ordinary dry skin. (See also Itching.) Normal skin owes its soft, pliable texture to its water content. To help protect against water loss, the outer layer of skin contains oil... read more Dry Skin (Xeroderma) , which is ordinary dry skin, ichthyosis is dry skin that results from an inherited disorder (called inherited ichthyosis) or from a number of other disorders or medications (called acquired ichthyosis).

Inherited ichthyoses

Inherited ichthyoses (the most common forms) are the result of genetic mutations that are usually passed on from parent to child but that sometimes occur spontaneously.

Inherited ichthyoses are seen at birth or develop during infancy or childhood.

There are many different types of inherited ichthyoses. Some affect only the skin, and others are just one part of inherited disorders that affect other organs.

Depending on the form, the scale may be fine or it may be large, thick, and warty. Scale may form on only the palms of the hands and soles of the feet, or it may cover most of the body.

Some forms of ichthyosis cause blisters, which may lead to bacterial infections.

Acquired ichthyoses

Diagnosis of Ichthyosis

  • Development of characteristic scales

  • For inherited ichthyoses, tests and consultation with a geneticist

  • For acquired ichthyoses, sometimes skin biopsy

Inherited ichthyoses are diagnosed when infants are born with or children develop the characteristic scales on their skin. Doctors do tests and consult experts in genetics (geneticists) to determine the cause of inherited ichthyoses.

Acquired ichthyoses are diagnosed when people develop the characteristic scales after taking a medication or developing an internal disorder.

Treatment of Ichthyosis

  • For any ichthyosis, moisturizers

  • For inherited ichthyosis, certain medications

  • For acquired ichthyoses, treatment of cause

  • For possible infection, antibiotics

Moisturizers are used to treat any form of ichthyosis. Ones that contain petroleum jelly, mineral oil, salicylic or lactic acid, ammonium lactate, ceramides, dexpanthenol, or urea should be applied immediately after bathing while the skin is still wet. Excess moisturizer can be removed by blotting with a towel.

To help remove the scales, adults can apply a solution of propylene glycol in water to the affected areas after bathing. The areas are then covered with a thin plastic film or bag overnight. The solution can be applied to children twice a day, but no film or bag is used.

For inherited ichthyosis, creams or pills containing substances related to vitamin A (retinoids), such as tretinoin cream, oral isotretinoin, or oral acitretin, help the skin shed the excessive scales.

For acquired ichthyosis, the underlying disorder is treated or the medication causing the ichthyosis is stopped.

People who are at risk of bacterial infection may be given antibiotics by mouth.

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