It is narrated from Sayyiduna Abu Kabshah al-Anmari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to have cupping done on the middle of his head and between his shoulders, and he would say: "Whoever lets out this blood from his body, it will not harm him if he does not treat any illness with anything else."
Hadith Referenceالمعجم الأوسط / باب الألف / 936
Hadith Takhrij«أخرجه أبو داود فى «سننه» برقم: 3859، وابن ماجه فى «سننه» برقم: 3484، والبيهقي فى «السنن الكبرى» برقم: 19591، والطبراني فى «الكبير» برقم: 858، 859»