When I was little, I had it on both my knees and both my elbows. I heard that UV tanning beds were good for it so I gave it a try. It got rid of it all. There were no signs of it for a long while but it did come back on my right knee. I haven’t done anything for it since then but it hasn’t come back on my elbows or my left knee. As far as I know, it won’t come back in any places other than where it was and according to my experience, there’s a 75% of it not coming back so I’d say the chances of it staying away are pretty good. I’m just going by my experiences though. I don’t have any medical evidence to back any of this up.