Focal dermal hypoplasia (FDH), also known as Goltz syndrome, is a rare multisystem disorder that principally involves the development of the skin, hands and feet and eyes. It is a type of ectodermal dysplasia, a group of heritable disorders causing the hair, teeth, nails, and glands to develop and function abnormally. A majority of the cases of FDH (about 90 percent) are seen in females. This disorder is characterized by skin abnormalities that develop into streaks or lines of tumor-like lumps on various parts of the body. This syndrome displays a wide array of symptoms and may affect almost any organ. FDH is caused by mutations or duplications/deletions in the PORCN gene.