I have a couple of familiar squiggles that have been there for years. If you ignore them, which is not always easy to do, you brain blocks them out but if you obsess about them, which is something I'm very good at, then they can drive you nuts...
But no, they are pretty harmless and usually a sign that your diet isn't quite right or you're not drinking enough water.
But no, they are pretty harmless and usually a sign that your diet isn't quite right or you're not drinking enough water.