What is wrong with my eyes?

My eyes felt very itchy about an hour ago, and I rubbed them a bit absentmindedly – not too unusual for me to have itchy eyes, due to allergies. They did feel more irritated than they normally do this time, though. I used some Visine and thought nothing of it. But when I glanced in the mirror a few minutes ago, I noticed an “extra” membrane on the inner corner of my eyes, especially pronounced in the left. Here are two pictures.

Is this a possible early symptom of pink eye? I don’t see any inflammation or redness on the conjunctiva of the whites of my eyes or on the inner lower eyelid. It’s just this weird extra rim of tissue that seems to be either swollen or ruptured. I can feel it, a little when I blink, but there’s no pain, and the itchy sensation has gone away.

Of course I’m going to an eye doctor tomorrow first thing, but for right now – I am seriously freaked out. Has anyone seen anything like this before?