I have pimples surrounding the head of my penis in the same area already affected by pearly penile papules. They itchy and painfull. Herpes result neg?

Penile pimples. It's possible that you have a yeast infection. Use an otc cream, e.g., clotrimazole, nystatin, Lamisil (terbinafine) twice a day for 1-2 weeks. If it's not any better, see your dermatologist.