question: Just got home from a water park. Was there for about 4 hours. I had these swimming trunks on that have an underwear type thing inside and is tight on my penis. While swimming I started to realize it was irritating my pen is so I went to the bathroom to fix it and I saw a red rash on the tip of my pen is. Can u explain what it may be and what I can use to treat this asap thank you.