Musnad Abu Ya'la al-Mawsili 118:47

Muhammad ibn al-Minhal narrated to us, Yazid ibn Zuray' narrated to us, Ma'mar narrated to us, from al-Zuhri, from Anas ibn Malik: That the Messenger of Allah (peace and blessings of Allah be upon him) cauterized As'ad ibn Zurarah for the *shawka* (a type of inflammation or pain).