Vitiligo Risk Factors: Understanding Causes and Contributing Factors

Vitiligo is an autoimmune depigmentation disorder. Risk factors include:

Established Risk Factors

• Family history: 20–30% have affected relatives; polygenic inheritance.
• Autoimmune comorbidities: Thyroid disease (Hashimoto's, Graves'), type 1 diabetes, Addison's, pernicious anemia, lupus, alopecia areata.
• Age of onset: Peak in childhood/young adulthood (10–30 years), but can start at any age.
• Skin phenotype: More visible in darker skin; similar incidence across races.
• Triggering events: Severe sunburn, skin trauma (Koebner phenomenon), chemical exposure (phenols, catechols), significant psychological stress.

Pathophysiology

Autoimmune destruction of melanocytes mediated by cytotoxic T-cells, oxidative stress, and genetic susceptibility (NLRP1, PTPN22, TYR, etc.). Convergence theory: genetic risk + environmental trigger + immune dysregulation = melanocyte loss.

Clinical Note

Vitiligo is not contagious. Early treatment (topical corticosteroids, calcineurin inhibitors, phototherapy) can stabilize and repigment. Screen for thyroid dysfunction at diagnosis and periodically.