I think it's because I overused it. I went about half a year without skipping a day and then it began to exfoliate the healthy skin. It only occurs on my bottom lip. This may be because the majority of the lotion moves to my bottom lip because of newtons law lol. I apply a very liberal amount and only on my top lip and the corners of my bottom lip because the lotion doesn't reach there well. This has been a bother lately but I'm learning to use less so it hasn't been happening as much. It may just be a coincidence because I wasn't having any problems with it for a while. It was like a miracle solution. It even taste ok. Still, if there was a better solution I'd love to try it. I would go every other day but I'm incredibly self-conscious which is a big part of why I have this condition to begin with. I think I did have a bout of OCD for a while to be honest.