<unk>  (abbreviated<unk>  is a skin condition caused by the hereditary deficiency of the steroid sulfatase (STS) enzyme that affects 1 in 2000 to 1 in 6000 males.<unk>  manifests with dry, scaly skin and is due to deletions or mutations in the STS gene.<unk>  can also occur in the context of larger deletions causing contiguous gene syndromes. Treatment is largely aimed at alleviating the skin symptoms. The term is from the Ancient Greek 'ichthys' meaning 'fish'.
X-linked ichthyosis
Keratoderma
Poikiloderma
Dyskeratosis congenita
Halogenoderma
Photodermatosis
Chyloderma
Bromoderma