AAD Vitiligo Guidelines: Evidence-Based Treatment

Overview / Definition Vitiligo is an acquired skin disorder marked by the loss of melanin due to the destruction of melanocytes. The result is well-defined depigmented macules and patches that can occur anywhere on the body, often leading to significant cosmetic concerns for patients. Epidemiology Vitiligo affects approximately 1% to 2% of the global population, with no significant gender predilection. It can develop at any age, though the onset is commonly observed in individuals between the ages of 10 and 30. The condition may have a familial tendency, and certain autoimmune diseases, such as thyroid disorders and type 1 diabetes, are more prevalent in individuals with vitiligo. Pathophysiology / Mechanism The exact mechanism behind vitiligo remains unclear; however, several hypotheses exist: Autoimmune Theory: The immune system mistakenly targets and destroys melanocytes. Genetic Predisposition: Certain genes may increase susceptibility to vitiligo. Oxidative Stress: An accumulation of free radicals may lead to melanocyte apoptosis. Neurogenic Factors: Neurotransmitters released from skin nerves may influence melanocyte function. Clinical Presentation Vitiligo typically presents as: Asymptomatic, well-defined depigmented patches. Commonly affects sun-exposed areas, such as the face, hands, and forearms. Can involve mucosal surfaces, including the mouth and genital areas. May be accompanied by premature graying of hair in affected areas. Diagnosis / Workup The diagnosis of vitiligo is primarily clinical, based on history and physical examination. Key steps in the workup include: Wood's Lamp Examination: Enhances the visibility of depigmented patches. Skin Biopsy: May be performed to rule out other conditions, such as pityriasis alba or tinea versicolor. Laboratory Tests: Thyroid function tests and other autoimmune markers may be indicated if associated autoimmune diseases are suspected. Treatment / Management Management of vitiligo focuses on repigmentation and co