Stretching (body piercing)
Stretching, in the context of body piercing, is the deliberate expansion of a healed piercing for the purpose of wearing certain types of body piercing jewelry. Ear piercings are the most commonly stretched piercings, with nasal septum piercings, tongue piercings and lip piercings/lip plates following close behind.
Source: Wikipedia — Stretching (body piercing) (CC BY-SA 4.0)