It is narrated from Hazrat Anas (may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) would go to visit a sick person, he would supplicate for him: "O Lord of the people! Remove this pain, grant healing, for You are the Healer. There is no healer except You. Grant such a healing that leaves no trace of illness behind."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 13823
Hadith Gradingحکم دارالسلام:إسناده من جهة حميد صحيح، ومن جهة حماد حسن، خ: 5742