I have had very small pimples on my scrotum in a cluster like since about two years ago. They come out in a cluster, painless and disappear on their own. Then they come back again and disappear many times sometimes after three days and even one or two months. They can also develop into one pimple before it disappears and are only on the scotum but different positions. They are sometimes trigered by friction during fore play or even bathing and rarely itchy and completele painless. Never developed into an ulcer but can become one pimple after some few hours. Please help.