Sayyiduna Abdullah bin Unays (may Allah be pleased with him) narrates: A Jew named al-Mustanir bin Rizam struck me in the face with a stick made from shawhat (a type of tree) and wounded me; the wound was either a munaqqilah, (the narrator is unsure; perhaps the words are:) or a ma'mumah. I came with that wound to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) uncovered it and blew on it, and after that I never had any trouble there.
Al-Tabarani recorded it. Its chain contains Abd al-Aziz bin Imran, and he is da'if (weak).