Sayyiduna Abu Kabshah al-Anmari (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) used to get cupped between the shoulder and the head, and he (peace and blessings be upon him) said: "Whoever lets out this blood, nothing will harm him, even if he takes no medicine."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19534