Red oval shaped mark on penis after sex

Hello i guess i wont get to the bottom of my problem without pictures...the last two times having sex with my gf this red mark is getting worse and not going away i really need some advice ...how do i upload pics thanks all

plz help ...so curious to what this is never had a penis issue before in ,my life 

Please...someone...

No replies on herebafter 24:hours?! What a joke!! Off to my local doctor for some real advice. ....

Question. Does it have a yellowish crusty scab on it? Does it tingle, itch, sore, hurt?

It doesnt have any feel to it... it peeled a little the other day...