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Ichthyosis
(Fish Scale Disease, Xeroderma)

Definition:
Ichthyosis is a dry skin condition. There are two general types:
  • Inherited ichthyosis – dryness and scaling of the skin due to hereditary factors. There are several forms.
  • Acquired ichthyosis – thickening and scaling of the skin that is not inherited but is associated with certain medical disorders.
Causes:
Inherited ichthyosis is caused by a genetic defect that is passed from parent to child or that occurs spontaneously.

Acquired ichthyosis is relatively rare but may be caused by any of the following:

  • Leprosy (extremely rare in the U.S.)
  • Under-active thyroid
  • Lymphoma
  • Sarcoidosis
  • AIDS
Risk Factors:
A risk factor is something that increases your chances of getting a disease or condition. Risk factors for ichthyosis include:
  • Family member with ichthyosis
  • Cold weather
  • Frequent or prolonged bathing, especially in hot water
  • Harsh soaps or detergents
  • Soaps or lotions containing certain scents or perfumes
Symptoms:
Ichthyosis can develop on any part of the body, but most often occurs on the legs, arms, or trunk. The symptoms can vary from mild to severe. In severe cases the condition may be disfiguring. Symptoms may include:
  • Dry, flaking skin
  • Scaling of skin that gives skin the appearance of fish scales
  • Shedding of layers of the skin
  • Itching of skin
  • In severe cases, scarring and/or infection due to rubbing and scratching of scales or blisters

With certain rare types of inherited ichthyosis, Symptoms:

  • Appear immediately at birth
  • Are extremely severe, and cover the entire body
  • Cause severe complications or death
Diagnosis:
The doctor will ask about your symptoms and medical history, and perform a physical exam. The diagnosis of ichthyosis is usually based on signs and symptoms of the disorder. Rarely, blood tests or a skin biopsy may be required.

Treatment:
Since there is no cure for ichthyosis, treatment consists of managing the symptoms. Most treatment is aimed at keeping the skin moist. In severe cases, medication may be prescribed. For the acquired form, treatment that lessens the severity of the underlying non-inherited condition may also help lessen the symptoms of the associated ichthyosis.

Moisturizing Skin
Many types of moisturizing ointments, lotions, and creams are used to lessen or alleviate symptoms of ichthyosis. These include:
  • Petroleum jelly
  • Mineral oil
  • Creams, lotions, and ointments containing vitamin A
  • A large variety of non-prescription, unscented moisturizers

For ichthyosis that causes scaling:

  • Solutions or creams with salicylic acid may help.
  • In some cases, doctors may suggest wrapping affected areas with a plastic or cellophane "bandage" after applying moisturizing agent. Such bandages should not be used on children.
Medications
In severe cases, drugs are sometimes prescribed, including:
  • Etretinate and isotretinoin (these medications are retinoids, which are derivatives of vitamin A; excess amounts of vitamin A can be harmful)
  • Antibiotics (if the skin becomes infected)
  • Disinfecting soaps (such as chlorhexidine)
Prevention:
There are no guidelines for preventing the development of ichthyosis. However, steps to prevent this condition from getting worse include:
  • Bathing less often
  • Applying non-scented moisturizing agents regularly and frequently (especially in winter)
  • Using only mild soap
  • Avoiding:
    • Harsh soaps
    • Soaps with scents or perfumes
    • Skin contact with detergents
    • Cold, dry weather, when possible
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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