Ichthyosis hystrix
![Edward Lambert, an Englishman who suffered from ichthyosis hystrix.](/Images/godic/202501/19/Tilesius2514.jpg")
Ichthyosis hystrix is a group of rare skin disorders in the ichthyosis family of skin disorders characterized by massive hyperkeratosis with an appearance like spiny scales. This term is also used to refer to a type of epidermal nevi with extensive bilateral distribution.