I've developed an embarrassing problem. On the head of my penis there's a reddish tint with small, circular white dots or lumps (almost like powder). It could just be a little infection or an abrasion or something. But I've been worried about it. It's been a week now - and it hasn't gotten worse, but it hasn't gone away either.

My biggest fear: this could be related to a stupid, drunk night I spent at the club with a girl I only met that night. I can't remember her name. I can’t even remember if we used protection. All I do remember is that, if I had been sober, I would never have gone with a girl like that.

I've only told one person about my embarrassing problem. He's advised me to see a doctor. But it's not that easy. I am too scared to go to the doctor, but I am also too scared to wait around. And it's too late to call myself an idiot because the deed has been done and cannot be undone.

Now I've got three problems: 1. I might have an STI. 2. My girlfriend might have the same STI (I've slept with her since this incident) and 3. If my girlfriend finds out I slept with somebody else, she'll dump me.

I’m an idiot.

Cheating is one thing. But catching an STI and passing it on to your girlfriend is a whole other kind of trouble. BadBoy needs to go straight to a PPAZ or Marie Stopes clinic and get his STI treated. He also needs to have an HIV test. But his girl also needs to know. What would you do?