Focal facial dermal dysplasia type IV (FFDD4) is a rare focal facial dysplasia (FFDD), characterized by congenital isolated preauricular and/or cheek blister scar-like lesions. The disease is focal facial dermal dysplasia type IV (Monarch Disease Ontology id MONDO_0013997). Also known as: FFDD type IV, FFDD4, focal Facial dermal dysplasia type 4, focal facial dermal dysplasia 4, focal facial preauricular dysplasia.