Used to struggle pretty hard with dermatillomania, which is compulsive skin picking. Imagine if every time you saw a pimple, bump, spot, scab, ingrown hair, etc. on your skin, every other thought disappeared to become one singular thought: GET RID OF IT. Then you scratch til it's gone, then you feel guilty about doing this disgusting thing to yourself, which triggers more anxiety, which makes you notice this pimple coming up, which makes you scratch it, which triggers more anxiety...
It's a vicious cycle.
Still catch myself at it every so often, but I've gotten FAR better than I was a year ago. Having someone in my life who I feel truly cares about me and trying to find the root causes of my anxiety and obsession with perfection with a counselor really helped. Now I'm trying to eliminate ever getting blemishes in the first place, because pimples are all I pick anymore.
Pretty mild, not really considered a real "disability" I suppose, since I can still do everything someone without can do, other than feel good in a two piece swimsuit ever again... I have multitudes of very dark scars all across my back that I'm not sure will ever go away without some expensive scar removal.