About 2 days ago I whipped myself in the eye pretty hard with a dish towel. It hurt well enough for about 30 minutes. Two days later as I was fussing with eyes (make-up, tweezing) I saw a brown spot on my caruncle. I know this was not there before (since I fuss a lot with my eyes). So I went to my optometrist to look at it and she said it was a Nevi. How could a nevi form so quickly since I know I did not see it before I hit myself in the eye.