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A group of skin disorders that cause dry, scaly, or thick skin.

Ichthyoses are usually inherited. Some types develop because of a genetic syndrome or disease, such as Hodgkin's lymphoma.

Symptoms depend on the type. The most common include dry, scaly skin; blisters; itching; and pain.

Medicines with salicylic acid or urea may relieve dryness and scaling. Serious cases may need a retinoid cream or other medicines applied to the skin.