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Focal dermal hypoplasia (also known as "Goltz syndrome") is a form of ectodermal dysplasia. It a a multisystem disorder which characterized primarily by skin manifestations to the atrophic and hypoplastic areas of skin which are present at birth. These defects manifesting as yellow-pink bumps on the skin and pigmentation changes. The disorder is also associated with shortness of stature. There is also some evidence that it can cause epilepsy.

Genetics
Focal dermal hypoplasia has been associated with PORCN gene mutations on the X chromosome. This results in 90% of the individuals who affected with the syndrome being female. The 10% of males that have a mosaic and/or heterozygous for mutations in PORCN. The commonly accepted, though unconfirmed, explanation for most of the affected individuals being women is that the non-mosaic hemizygous males are not viable.

The differential diagnosis of focal dermal hypoplasia (Goltz) syndrome includes autosomal recessive Setleis syndrome due to TWIST2 gene mutations. It associated with morning glory anomaly, polymicrogyria, incontinentia pigmenti, oculocerebrocutaneous syndrome, Rothmund-Thomson syndrome and microphthalmia with linear skin defects (also known as MLS) syndrome because they are all caused by deletions or point mutations in the HCCS gene.

Jessner-Cole syndrome
The disorder was first formally recognized by dermatologists, Max Jessner and Harold Newton Cole, in the early 20th century. Jessner and Cole's papers were referenced more than any others in the first half of the 20th century.

Goltz-Gorlin
Besides its formal name, it is most commonly refereed as Goltz-Gorlin syndrome, after Robert Goltz and Robert Gorlin. Goltz and Gorlin worked together at the University of Columbia and are credited for describing the symptoms of the disorder in more detail than ever before and tracking its genetic trends. The name became popular during the second half of the 20th century.