I wouldn't be surprised if some portion of people had non permanent skin damage after long term usage. But I also think that would be a small percentage of people and most likely related to hygiene and skin irritation from long term wear and adhesive removal. I have only been wearing for 4 months now, and the only irritation I have is from when I had problem getting the ghost bond off of a couple areas and really had to scrub at it. That was fixed by finally finding a good adhesive remover that took it off super easily. Can't speak to usage over years though of course