Ichthyosis

Ichthyosis is a family of genetic dermatological conditions seen in humans and domestic animals. The word comes from Greek ιχθύωσις lit. "forming fish", as people or animals with ichthyosis have scaly skin which can vaguely resemble the scales of a fish.

The term ichthyosis is sometimes used to refer to the specific condition ichthyosis vulgaris. Ichthyosis was formerly referred to as "pseudo-leprosy," as it can produce an appearance superficially similar to that of leprosy.

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Types

While ichthyosis acquisita is acquired (as its name indicates), most forms of ichthyosis are considered congenital. These types include:

Some types of ichthyosis include:

• Ichthyosis vulgaris
• X-linked ichthyosis
• Ichthyosis lamellaris
• Epidermolytic hyperkeratosis
• Harlequin type ichthyosis
• Netherton's syndrome
• Sjögren-Larsson syndrome

Ichthyosis in domestic dogs

Ichthyosis of varying severity is well-documented in some popular breeds of domestic dogs. The most common breeds in which this condition manifests itself are Golden retrievers, American bulldogs, Jack Russell terriers, and Cairn terriers.

Diagnosis

A physician (or veterinarian) often can diagnose ichthyosis by looking at the skin. A family history is also very useful. In some cases, a skin biopsy will be done to help to confirm the diagnosis. In a biopsy, a small piece of skin is removed and examined under a microscope. In rare instances, genetic testing may be helpful in making a diagnosis. Ichthyosis is not more or less common in any ethnic group. As of now, there is no way to prevent ichthyosis.

Treatments

Treatments for ichthyosis often take the form of topical application of creams and emollient oils, in an attempt to hydrate the skin. Retinoids are also used for some conditions. Exposure to sunlight may improve or worsen the condition.

There can be ocular manifestations of ichthyosis, such as corneal and ocular surface diseases. Vascularizing keratitis, which is more commonly found in congenital keratitis-ichythosis-deafness (KID), may worsen with isotretinoin therapy. Ectropion, if it occurs, can be treated surgically after skin hydration.

See also

• psoriasis
• dermatitis
• emollient
• list of skin diseases