Hey there, I had unprotected sex a little over a month ago. I got tested for stds at 1 month and everything came back negative including syphillis. However, now a red circle appeared on my penis. It pretty much looks like it peeled and red is just under it. I know it's skin because like 3 days after darker skin formed on top of it which I ended up peeling off and it brought it back to the red skin. Can a chancre appear like this ? A circle that looks like it peeled, it's completely flat it just looks like a perfectly peeled circle, no pus or anything. Thanks.