Maybe to some of you this post is going to be useful. My baby was born with a thin line under his eye. Nobody knew what that was. And it just kept growing. When he was 3 months we were told it was a strawberry birth mark and but the place of its location wasn’t fortunate. So they said it should go away by the time he is 2 years old. Looks like it is really going away. Posting pictures in the comments