Colloidion baby is a characteristic clinical entity which may precede the development of one of a variety of ichthyoses or occur as an isolated and self-limiting condition. The condition is usually a manifestation of congenital ichthyosiform erythroderma (CIE) or lamellar ichthyosis (LI) and is responsible for about 2/3 of colloidion babies. Like a harlequin fetus, a colloidion baby appears to one phenotype for several genotypes. These two lesions may be the first signs of an ichthyosis transmitted as an autosomal dominant trait in about 10% of the cases. Colloidion baby is inherited in an autosomal recessive manner. Sex linked ichthyosis never begins with a colloidion baby syndrome (1–5). The term collodion baby is used for newborns in which all the body surface is covered by thick skin sheets, so called “collodion membrane”. The collodion membrane is the result of an epidermal developmental dysfunction. 

Key words: Collodion Baby; Ichthyosis.