Zayd bin Aslam (may Allah have mercy on him) said that the Sunnah has been established concerning the organs of a person; then he narrated a long hadith in which was also: "For the lips too there is the diyah." And it is reported from Amr bin Shu'ayb (may Allah have mercy on him) that Abu Bakr (may Allah be pleased with him) ruled 100 camels for the two lips.
And it is likewise reported from al-Sha'bi (may Allah have mercy on him) that for each lip there is half the diyah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16247