Congenital Localized Hypopigmentation Disorders as a Clue of Severe Neurologic Involvement: An Update Review

In clinical practice, cutaneous disorders associated with neurologic involvement are relatively common, as both cutaneous and systems often originate from similar or synchronous embryonic mechanisms. Cutaneous hypopigmentation includes a wide range of disorders that can be categorized congenital and acquired based on the onset, and as localized and generalized types, depending on their skin distribution. Although cutaneous hypopigmentation may appear as a benign clinical manifestation, its association with neurologic or others systemic involvement can indicate more severe underlying disorders. This literature review focuses on congenital localized types of cutaneous hypopigmentation that are classically linked to neurologic impairment. Four congenital disorders were highlighted for their characteristic presentation of localized cutaneous hypopigmentation and neurologic involvement: Waardenburg syndrome, incontinentia pigmenti, hypomelanosis of Ito, and tuberous sclerosis complex.Clinical and genetic findings for these conditions were reviewed and updated, with an emphasis on the cutaneous manifestations, associated systemic anomalies, and neurologic involvement. Established diagnostic criteria and emerging trends in therapeutic approaches were also explored. Promising results, particularly the use of mammalian target of rapamycin (mTOR) in the treatment of tuberous sclerosis complex, highlight the potential for improved outcomes. Early diagnosis, rapid treatment, and innovative therapies may play a crucial role in positively altering the clinical course of these disorders.