The doctor will likely also ask about other medical issues and perform a skin biopsy or obtain a cheek cell sample. Ichthyosis vulgaris is often called fish scale disease because the scales that characterize the condition look like fish scales.Ī doctor diagnoses the condition by looking at the skin changes and determining if anyone else in the family has a similar problem. It usually develops in early childhood, typically between the ages of 2 and 5. Ichthyosis is a relatively common condition, impacting approximately 1 in every 250 people. It accounts for nearly 95 percent of all ichthyosis cases. There are more than 20 different types of ichthyosis, but ichthyosis vulgaris is considered the most common form. Ichthyosis vulgaris is a type of ichthyosis, a group of related skin conditions that interfere with the skin’s ability to shed dead skin cells, causing extremely dry, thick skin.Įxtremely dry, scaly skin is known as xerosis. Share on Pinterest Ichthyosis vulgaris is the most common form of ichthyosis, a group of skin conditions.

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