Have you had unprotected sex?
It could be an STD, a yeast infection, genital psoriasis, or any number of things.
As for the little bumps...penile papules, are common and nothing to worry about. I'm not saying this is your problem though, and I would suggest seeing a doctor to rule out any diseases.
Ive never had sex...ok thanks,
I saw pictures of a friction rash? It was sort of similar looking to that is that possible?