When Messenger of Allah ﷺ visited the sick he would say: Lord of the people. remove the disease, cure him, for Thou art the great Curer, there is no cure but through Thine healing Power, which leaves nothing of the disease. (Using translation from Muslim 2191c)
أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا عَادَ مَرِيضًا قَالَ أَذْهِبِ الْبَأَسَ رَبَّ النَّاسِ وَاشْفِ إِنَّكَ أَنْتَ الشَّافِي وَلَا شِفَاءَ إِلَّا شِفَاؤُكَ شِفَاءً لَا يُغَادِرُ سَقَمًا