A Systematic Review of Cutaneous Hypopigmentation Disorder Associated with Neurologic Involvement

Background/Objectives: Cutaneous hypopigmentation is a common clinical sign observed in a variety of disorders. It may be congenital or acquired, localized or diffuse, and can range from benign to being associated with systemic conditions, including those affecting the central nervous system. Recognition of the key clinical features associated with each disorder is essential for accurate diagnosis and for differentiating one condition from another. Methods: PubMed, Embase, and Scopus databases were used to prepare a systematic review. Search terms were: "congenital", "cutaneous", "localized", "diffuse", "hypopigmentation" and "neurological disorders/signs". The focus was on congenital cutaneous hypopigmentation, distinguishing between localized and diffuse presentations, with emphasis on neurological involvement. Peer-reviewed articles, case series, and original studies with neurological manifestations of the disease were reviewed. Cutaneous hypopigmentation disorders associated with diffuse cerebral involvement include syndromes such as Chediak-Higashi, Griscelli, Elejalde, Cross, Tietz albinism-deafness, Prader-Willi, Angelman, and several congenital metabolic disorders. In contrast, the 'localized' group comprises syndromes such as Waardenburg, Incontinentia pigmenti, and the phacomatoses, including hypomelanosis of Ito and tuberous sclerosis complex. Results: Overlapping phenotypes and genetic heterogeneity lead to diagnostic challenges and potential errors suggesting multiple specialists. The main clinical features of each disorder are discussed, with particular attention paid to neurological signs. A practical flowchart is provided to help distinguish between 'diffuse' and 'localized' forms with neurological involvement. Conclusions: Early identification of cutaneous features, followed by comprehensive clinical and instrumental evaluation, enables timely and accurate diagnosis, ultimately improving the clinical outcomes for affected children.