About a year & a half ago I started to notice dark lines around my lips - it looks like lip liner. It's on the lips itself, not above or below. I have been to a number of dermatologists and they all say it's from the sun (I live in a tropical climate) but I always use sunscreen on my lips and stay out of the sun as much as possible. It seems to be getting worse. I read online that it might be a result of stomach and digestion problem? I have been suffering from gastro problems for a while.
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