It is reported about Sayyiduna Abd al-Rahman bin Khalid bin al-Walid (may Allah be pleased with him) that he had himself cupped on his head and between his two shoulders. The people said: "O Amir! Are you having yourself cupped?" He said: "The Prophet (peace and blessings be upon him) used to have himself cupped on the head, and he used to say: 'Whoever sheds this blood, it will not harm him if he does not use anything as medicine (or as treatment).'"
Al-Tabarani recorded it. To my knowledge, Sayyiduna Abd al-Rahman bin Khalid does not have the honour of being a Companion. I do not know the narrator named Abu Hazzan. The remaining narrators of this report are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطب / 8340