Musannaf Ibn Abi Shayba 18:101

Abu Bakr narrated to us, he said: Yahya ibn Sa’id al-Qattan narrated to us, from Yahya ibn Sa’id, from Sulayman ibn Yasar, he said: The *mudihah* (a wound that exposes the bone) on the face is like the *mudihah* on the head, except if there is a disfigurement on the face. Then, according to the extent of that, it is increased until it reaches half the blood money of the *mudihah*.