MASNOON (SUNNAH) PRAYER FOR A SICK PERSON

The third etiquette of doing Iyadat (visiting a sick person) is that if you think it would be acceptable to the sick person and their family, and it will not cause inconvenience or distress to the sick person, then put your hand on their forehead and recite:

اللھم رب الناس اذھب الباس انت الشافی لا شافی الل انت لا یغادر سقما۔ (ترمذی، کتاب الجنائز)

It means, O' Allah! Who is All-Sustaining for all human beings, who can remove distress from people, please grant health to this sick person, you are the One who can grant health, there is no one but You who can grant health to a person. Please grant them such a state of health that it does not leave any remnants of the disease. 

From the talk "The etiquette of Iyadat (visiting a sick person) by Mufti Muhammad Taqi Usmani Daamat Barakatahum