After walking around downtown in extremely uncomfortable heels, I managed to give myself a blister which had completely peeled off due to my shoe in that short amount of time. All that was left was a terribly painful absence of skin that seemed to go quite deep. It basically just took off a chunk of my skin under my foot near my toes. Now that it has begun to heal, it is very red and seems like it has a clear watery discharge on top of it. What is this?