###Human: Are rashes on penis due to sexually transmitted disease? ###Assistant: Hi. I saw your clinical pictures (attachment removed to protect patient identity), genitals look normal clinically, skin is little dry, I do not see any rash, blister or ulcer which are the manifestation of STD. In the first picture, those white tiny bumps below the glans (tip of the penis) are the harmless ones, they are called pearly penile papules. Are you referring to them? Herpes will have painful blisters in a group with redness at the base. Syphilis, chancroid will have ulcers. Gonorrhea presents with pus from the urethra, pain while urinating. At present, with your history and clinical pictures, I do not see any symptoms or signs of any STD.