Annular epidermolytic ichthyosis (AEI), also known as cyclic ichthyosis with epidermolytic hyperkeratosis (CIEHK), is a rare phenotypic variant of bullous congenital ichthyosiform erythroderma. AEI is an autosomal dominant disorder characterized by intermittent development of polycyclic, erythematous, scaly plaques on the trunk and proximal extremities. Mutations in keratin 10 or 1 have been identified in AEI.
