Every subculture has an anchor placement, and for emo it is the lower lip. The mid-2000s wave — MySpace profiles, side fringes, band tees — made a single lip ring or a snake bites pair the fastest visual shorthand for the scene. Two decades later that association still holds, which is why lip jewelry does more for an emo look than any three ear piercings combined.
The face-forward logic matters. Emo style is built around the face: dramatic eyeliner, dyed black or two-tone hair, expression over polish. Piercings that live in that frame — lip, septum, eyebrow — read instantly, while ear-only setups can pass as any aesthetic at all.
None of this means you must start with a facial piercing. Plenty of emo looks run on a septum ring and dark ear jewelry alone. But if you are deciding where the first needle goes and you want the look to be unmistakable, the lip is the historically correct answer.