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https://www.news-medical.net/health/Idiopathic-Guttate-Hypomelanosis-(IGH)-Differential-Diagnoses.aspx Idiopathic Guttate Hypomelanosis (IGH): Differential Diagnoses Feb 26, 2019 - Idiopathic guttate hypomelanosis (IGH) is a common benign skin condition. It appears as multiple round or oval macules of depigmentation or hypopigmentation,... idiopathichypomelanosisighdifferentialdiagnoses