I am a 26 year old male, I have been excessively masturbating meaning once or twice a day for last 13 years and I am noticing that my penis color which was my natural white tone has become black and also my pubic area is black, also when cleaning my penis if I pull my foreskin and clean later while urinating my penis hurts, also I am now scared as to what are the downfalls and future problems will be because of this, kindly help me and let me know full details as to how I can solve and what necessary precautions to be taken?