Allahum-mashfi, Antash-Shafi, la shifa'a illa shifa'uka, shifaan la yughadiru saqaman
(O Allah! cure You are the Great Curer. There is no cure but through You, which leaves behind no disease)

Narrated Abu Hurairah (radi Allahu anhu) that the Prophet (sal Allahu alaihi wa sallam) said: “There is no disease that Allah has sent down except that He also has sent down its treatment.” [The Book of Medicine: Sahih Bukhari]