Recently I noticed that I have a thick, kind of dark line on each of my eyelids, right above my eyelashes. It's the color of a slight bruise, like I may have damaged some blood vessels, but I haven't done anything to them. They're slightly thicker than a nickel.
Could it be a symptom of something? Could I just be straining my eyes, or is it related to sleep? I have racked up an impressive sleep debt over the last 6 or so months.
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