Riyad as-Salihin

Anas (May Allah be pleased with him) reported: The Prophet (ﷺ) used to supplicate: "Allahumma inni a'udhu bika minal-barasi, wal- jununi, wal-judhami, wa sayyi'il-asqami' (O Allah! I seek refuge in You from leucoderma, insanity, leprosy and evil diseases)."

[Abu Dawud].