Do people notice your nuckels? And what do you tell them?

I've had a few people comment on mine and I'm never really sure what to say. One person jokingly asked if I punched a wall so I went along with it and changed the subject. My best has noticed that its pretty much constant and has brought it up a few times now. I would tell them the truth but it just never really seems like the right time.

Anyway, I was also wondering if anyone else starts to get triggered if they haven't been purging as much and their knuckles start to heal.