Whenever Messenger of Allah ﷺ became sick, he would recite Mu'awwidhat (Surat Al-Falaq and Surat An- Nas) and then blow his breath over his body. When he became seriously ill, I used to recite (these two Suras) and rub his hands over his body hoping for its blessings. (Using translation from Bukhārī 5016)   

قَالَتِ اشْتَكَى رَسُولُ اللهِ ﷺ فَكَانَ يَقْرَأُ عَلَى نَفْسِهِ بِالْمُعَوِّذَاتِ وَيَنْفُثُ فَلَمَّا اشْتَدَّ شَكْوُهُ جَعَلْتُ أَقْرَأُ عَلَيْهِ وَأَنْفُثُ وَأَمْسَحُ عَلَيْهِ بِيَدَيْهِ رَجَاءَ بَرَكَتِهَا  

[Machine] Aisha, the wife of the Prophet Muhammad (PBUH), fell ill, so I placed my hand on his chest and said, "Remove the sickness, O Lord of the people, you are the Healer." The Messenger of Allah (PBUH) used to say, "Join me with the highest companion, and join me with the highest companion."  

عَائِشَةُ مَرِضَ رَسُولُ اللهِ ﷺ فَوَضَعْتُ يَدَهُ عَلَى صَدْرِهِ فَقُلْتُ أَذْهِبِ الْبَأْسَ رَبَّ النَّاسِ أَنْتَ الطَّبِيبُ وَأَنْتَ الشَّافِي فَكَانَ يَقُولُ رَسُولُ اللهِ ﷺ «وَأَلْحِقْنِي بِالرَّفِيقِ الْأَعْلَى وَأَلْحِقْنِي بِالرَّفِيقِ الْأَعْلَى»