Sayyiduna Hanzalah (may Allah be pleased with him) narrates: His father Hidhyam said: O Messenger of Allah! I have several sons, and this is the youngest of my sons, so supplicate for blessing for him. He ((peace and blessings be upon him)) said: "Come, O boy!" Then he took hold of both my hands, passed his hand over my head and said: "May Allah bless him." The narrator said: I saw that a person with a swelling would be brought to Hanzalah, and he would pass his hand over him and say: "Bismillah (In the name of Allah)", and the swelling would go away.
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3488