أَذْهِبِ الْبَأْسَ رَبَّ النَّاسِ، بِيَدِكَ الشِّفَاءُ، لَا كَاشِفَ لَهُ إِلَّا أَنْتَ
Adh-hibil-ba'sa Rabban-nasi, bi yadikash-shifa'u, la kashifa lahu illa anta
Remove the affliction, O Lord of mankind. In Your hand is the cure. None can remove it except You.
Recite while placing hand on the sick person
Aisha (RA) reported that the Prophet (PBUH) would recite this when any of his family members fell ill.