It's not answered below and it is stated by someone else. Occasionally during the day, I feel like there is a drop of water on my right eyelid. I think it's after I blink and the eye is re-opening. It is definitely on the outside. Just a feeling. Like a drop from an eye dropper, or smaller even. A cool drop on the outside, on the skin. As small as a drop from a toothpick - but of course I know there is nothing there. Been going on for about 3 weeks now.