Article
Segmental macular hyperpigmentation: new genes, new clinical implications.
The British journal of dermatology - 17 Oct 2025
Kinsler Veronica A, Knöpfel Nicole, Polubothu Satyamaanasa
Abstract excerpt
BACKGROUND: Segmental macular hyperpigmentation (SMH) is macular hyperpigmentation in a defined developmental pattern, presenting at birth or in the early years. The only known cause of this phenotype has been mosaicism of gene GNAS, as part of McCune-Albright syndrome. It is unknown how often GNAS mosaicism is the cause of SMH presenting to dermatology or whether there are other genetic causes for the phenotype...
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