Ichthyosis is a dry skin condition. There are two general types:

  • Inherited ichthyosis—dryness and scaling of the skin due to hereditary factors
  • Acquired ichthyosis—thickening and scaling of the skin that is associated with certain medical disorders

Inherited ichthyosis is caused by a genetic defect that is passed from parent to child or that occurs on its own.

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