Musnad Ahmad 32:427

Abu Kamil narrated to us, Hammad bin Zayd narrated to us, from Salam al-Alawi, who said: I heard Anas bin Malik [say] that the Prophet, peace and blessings of Allah be upon him, saw a yellow mark on a man and disliked it. He said: "If you were to order this man to wash off this yellow mark." He said: And he would hardly ever confront anyone to their face with something they disliked.