I am a 22 year old, sexually active male. I have had no problems with my penis until last year when I applied Sunsilk shampoo on it to maintain erection. I forgot to wash it off and the next day I woke up, I saw dry, flaky skin all over my penis and testicles. Since then, I have always found it difficult to maintain erection and there's been a drastic decrease in the sensations that I feel. There's also a purplish/blackish vein that has become visible since that incident and it runs all the way from the base of my testis to the glans.Moreover, there's a black ring that has formed around my penis since then. I have no issues with urinating, however.
Any help on this matter would be highly appreciated. Thanks.