Talk to Dermatologist on Pimples In The Lower Part Of Penis

I m 30 years old,and unmarried.i used to masturbate and pimples emerged... now i hv left masturbation butA small visible pimples are emerged in the lower part of skin of my dick,these pimples are not vanishing...i m unable to understand why these r emerged...these donot grow,and donot pain..kindly suggest me the dr ? Why it has issue wd me? These hv also affecting erection...