chhùi-tûn-chu喙脣珠

protruding pearl-shaped muscle on the middle

protruding pearl-shaped muscle on the middle of the upper lip

English Wiktionary, “喙脣珠” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%96%99%E8%84%A3%E7%8F%A0 · confidence: Medium (Wiktionary)