there's just this scene where someone says that their piercing has healed and now there's just a hole there

sorry that's all i can remember and it's really bugging me

What does "piercing" mean? I mean, "piercing" what?

Hajimari no Niina, around the middle of the first chapter.

If it's not the above, could it be Horimiya? I'm not 100% sure, but that phrase sounds familiar as well :/

hi this is literally 4 years late but thanks! it was hajimari no nina