The Messenger of Allah ﷺ used to have himself cupped on the top of his head and between his shoulders, and that he used to say: If anyone pours out any of his blood, he will not suffer if he applies no medical treatment for anything.  

أَنَّ النَّبِيَّ ﷺ كَانَ يَحْتَجِمُ عَلَى هَامَتِهِ وَبَيْنَ كَتِفَيْهِ وَهُوَ يَقُولُ مَنْ أَهْرَاقَ مِنْ هَذِهِ الدِّمَاءِ فَلاَ يَضُرُّهُ أَنْ لاَ يَتَدَاوَى بِشَىْءٍ لِشَىْءٍ  

The Prophet ﷺ had himself cupped three times in the veins at the sides of the neck and on the shoulder. Ma'mar said: I got myself cupped, and I lost my memory so much so that I was instructed Surat al-Fatihah by others in my prayer. He had himself cupped at the top of his head.  

أَنَّ النَّبِيَّ ﷺ احْتَجَمَ ثَلاَثًا فِي الأَخْدَعَيْنِ وَالْكَاهِلِ قَالَ مَعْمَرٌ احْتَجَمْتُ فَذَهَبَ عَقْلِي حَتَّى كُنْتُ أُلَقَّنُ فَاتِحَةَ الْكِتَابِ فِي صَلاَتِي وَكَانَ احْتَجَمَ عَلَى هَامَتِهِ