A while back I noticed cysts starting to form on my scrotum, just a couple of months ago I decided to seek medical advice, so I went to a dermatologist, who seemed exceptionally qaulified (Graduate of University of Michigan and over thirty years experience) and he said they were sebaceous cysts. He said they were not anything to worry about and if they started to bother me I could pop them (when I do an oily, substance, more thick than pus with a bit of a foul odor comes out). I was curious about my cysts so I decided to do some research online and it said that they can be diagnosed just by having a trained eye looking at them, and in some cases need to be sent in for a biopsy, now he did not send them to get a biopsy, so I was wondering if I am just being paranoid? I tend to over-worry sometimes, and I was fine with what he said, but reading how sometimes it needs to be sent it to make sure it is nothing else. I have many of them and they all secrete the same substance. Thanks!