Picture of X-Linked Ichthyosis
X-linked ichthyosis. X-linked ichthyosis is a rare genetic skin disorder in which skin cells don't properly separate or shed. This leaves behind rough, dark, scaly skin. While this photo shows it on the legs of a patient, it is most commonly found on the trunk of the body or the neck. It is caused by a deficiency of the enzyme steroid sulphatase. Only males are affected, although women can be carriers. While creams and emollients to exfoliate and hydrate the skin can help, there is no cure.
Text Source: National Organization for Rare Disorders