When The Prophet (sal-Allaahu 'alayhe wa sallam) would enter upon a sick person, he would say:

لَا بَأْسَ طَهُوْرٌ إِنْ شَاءَ اللّٰهُ

Do not worry, it will be a purification (for you), Allah willing.

Laa ba'sa tahoorun 'inshaa'Allaah.