The Prophet (ﷺ) said: If anyone has himself cupped on the 17th, 19th and 21st it will be a remedy for every disease.
Sunan Abi Dawud Book 29, Hadith 7
← Previous Hadith 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.

Sunan Abi Dawud Book 29, Hadith 6 Next Hadith → (the narrator other than Musa said that Kayyisah daughter of AbuBakrah) She said that her father used to forbid his family to have themselves cupped on a Tuesday, and used to assert on the authority of the Messenger of Allah (ﷺ) that Tuesday is the day of blood in which there is an hour when it does not stop.

Sunan Abi Dawud Book 29, Hadith 8