Sayyiduna Hanzalah bin Hidhyam (may Allah be pleased with him) relates: I came with my grandfather Sayyiduna Hidhyam (may Allah be pleased with him) to the Messenger of Allah (peace and blessings be upon him), and he said: "O Messenger of Allah! I have several sons, some bearded (grown men) and some otherwise, and this one (Hanzalah) is the youngest of them." So the Messenger of Allah (peace and blessings be upon him) drew me close to him, passed his blessed hand over my head and said: 'Barak Allahu fik' (May Allah bless you). Al-Dhayyal (may Allah have mercy on him) said: I saw that a man whose face was swollen, or a goat whose udder was swollen, would be brought to Sayyiduna Hanzalah (may Allah be pleased with him), and he would place his hand on the spot that the palm of the Messenger of Allah (peace and blessings be upon him) had touched and say 'Bismillah' (In the name of Allah), then wipe over it, and the swelling would go away.
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Hanzalah (may Allah be pleased with him) except with this chain, and Abu Sa'id (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 2896
Hadith Takhrij«أخرجه أحمد فى «مسنده» برقم: 20996، والطبراني فى «الكبير» برقم: 3500»