Thanks for your query.Based on the description of your issue it appears that you have multiple Sebaceous Cysts over scrotum
and at the base of the penis. .Scrotal skin has more sebaceous glands that in the rest of the skin .So it is more prone to get sebaceous cyst frequently due to excessive sweating
.Please clean up the entire area twice daily with warm soap water and wash your inner wares in hot water mixed with some antiseptic lotion like Dettol
.You can take some antibiotics for 1 week to prevent these cyst from getting infected. Normally they will subside in 2 weeks.