I've recently finished a round of antibiotics for a sinus infection and a few days later I noticed a blotchy red spot on my penis. It wasn't a blister or anything and wasn't painful. The next day it seemed to spread and spread and then it began to show up some right below the head. I've never ever had any problems with my penis before and I haven't had sex in the past few months so I'm ruling out std's. Could this be a penile yeast infection? The reason I'm thinking this is because I've also developed painful cracks on either side of my mouth which sounds like thrush, which is also caused by a yeast infection.View Thread