Wrinkles in my resin paperweight?

I have just made a paperweight out of casting resin on Saturday. Today, Monday, I took it out of the mold to see how it was looking. It was pretty solid, still a little sticky. I noticed on the corners of the cube ( my mold is a 2.5 inch cube) and there are wrinkles on them, looking almost like veins in an arm. I was wondering if there is a way to get them to go away or to cover them up. Did this happen because I took it out so soon? It seemed like they were there as I was taking it out, but this was my first time using resin. Thank you!