Musnad Ahmad 490:3

Waki’ narrated to us, Sufyan narrated to us, from Iyad ibn Laqit al-Sadusi, from Abu Rimtha al-Tamimi, who said: I went out with my father until I came to the Messenger of Allah, may Allah bless him and grant him peace. I saw on his head the traces of henna, and I saw on his shoulder something like an apple. My father said: "I am a physician, shall I lance it for you?" He said: "Its physician is the One who created it." He said: And he said to my father: "Is this your son?" He said: "Yes." He said: "As for him, he does not commit a crime against you, and you do not commit a crime against him."