Aatrilal (Ammi majus Linn) is an important unani drug for treatment of vitiligo. It belongs to family Apiaceae. It is originated in Egypt. But now it is successfully cultivated in India. It is the principal commercial source of Xanthotoxin. Xanthotoxin is used in the treatment of Vitiligo (Leucoderma).It is also used as diuretic, blood purifier, detergent, emmenogogue, and has antispasmodic and anti inflammatory properties. In Unani system of Medicine Aatrilal is used both internally as well as externally in the patients of Bars (Vitiligo). A number of clinical studies have been carried out with the Aatrilal in the treatment of vitiligo. These trials have shown significant results.