أَذْهِبِ الْبَأْسَ رَبَّ النَّاسِ وَاشْفِ أَنْتَ الشَّافِي لَا شِفَاءَ إِلَّا شِفَاؤُكَ شِفَاءٌ لَا يُغَادِرُ سَقَمَاً
Ayesha (R.A.) stated that when anyone among them had an illness, Prophet Mohammad (SAW.) used to rub the area of the pain reciting the above dua:
O Lord of the people, remove this pain and cure it, You are the one who cures and there is no one besides You who can cure, grant such a cure that no illness remains.
Ayesha (R.A.) stated that when Prophet Mohammad (SAW.) was ill, he used to recite the four Quls, blow on his hands and pass them over on the back and front. He also recited these surahs, blew on his hands and passed them over his body during his fatal illness.
(Bukhari, Muslim)