A Strange Skin Reaction

Now, I've never had anything like this happen before. I didn't notice it until I was in the shower, but below my left knee cap, I had this hard, plateau-like nickel-sized reaction on my skin! I also had a few red splotches in random places on my body too.  Check out the reaction on my knee:


Weird, right?! Pardon how up-close and personal my knee is. It was surprisingly hard to get the camera to capture this.

I just don't know what to think about it! I immediately put steroid ointment on it after the shower and by mid-day, it was only a red splotch. Now, it's practically gone.

I was trying to figure it out, but I just can't! Sooo strange...