I m a teenage male and I ve masterbated ever since I was 10 or 11. But now, every single time I masterbate, my penis get a red rash type thing right below the head. It goes away after a while but when I masterbate, it comes right back. My penis also feels somewhat sore after masterbating. What should I do to make the redness go away & for my penis to not feel sore? Also, if I masterbate too much with a grip that is too tight (without any form of lubricant), can it damage my penis?