Mondo Description Harlequin ichthyosis (HI) is the most severe variant of autosomal recessive congenital ichthyosis (ARCI). It is characterized at birth by the presence of large, thick, plate-like scales over the whole body associated with severe ectropion, eclabium, and flattened ears, that later develops into a severe scaling erythroderma.

Uniprot Description A rare, very severe form of congenital ichthyosis, in which the neonate is born with a thick covering of armor-like scales. The skin dries out to form hard diamond-shaped plaques separated by fissures, resembling 'armor plating'. The normal facial features are severely affected, with distortion of the lips (eclabion), eyelids (ectropion), ears, and nostrils. Affected babies are often born prematurely and rarely survive the perinatal period. Babies who survive into infancy and beyond develop skin changes resembling severe non-bullous congenital ichthyosiform erythroderma.

Disease Ontology Description An autosomal recessive congenital ichthyosis characterized by severe neonatal ichthyosis with bilateral ectropion and eclabium, flattened and rudimentary nose and ears. constricting bands around the extremities and frequently lethality during infancy that has_material_basis_in homozygous or compound heterozygous mutation in the ABCA12 gene on chromosome 2q35.