Answer- A. Ichthyosis Vulgaris
Ichthyosis is one of the most common genodermatoses. It is characterized by dry (xerotic) scaly skin all over the body. Scales are dull-brown-black. The basic defect is an impairment in the barrier function of skin and inability to maintain moisture.
Ichthyosis can be divided into : –
- Inherited ichthyosis (Ichthyosis Vulgaris, X-linked Ichthyosis, Lamellar ichthyosis, epidermolytic hyperkeratosis).
- Syndromal ichthyosis
- Acquired ichthyosis (Ichthyosis acquisita).
The most common type of ichthyosis is ichthyosis Vulgaris in which there is a deficiency of filaggrin a protein found in the granular layer (stratum granulosum)
Many different metaphors have been used to describe the appearance and texture of the skin in various types and stages of ichthyosis, e.g., alligator skin, Crocodile skin (Sauroderms), Fish skin and porcupine skin.
Ref- Arvind Arora skin, 6th edition, page no 203