Musnad Ahmad 1153:1353

Hashim narrated to us, Mughira narrated to us, from Ibrahim, from Aisha, that she said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "The place of cauterization is fomentation, the place of leeching is nasal drops, and the place of blowing (into the mouth) is the side of the mouth."