Black raised bumps on shaft of penis

Patient : I noticed a pimple-like red, raised bump on my penis last week which turned dark red, black- now a second one has manifested as the first is slowly going away. They do not itch or hurt. I picked at the first one and it just seems to be a scab- no head to it, discharge, or puss. They are quite unsightly and a bit worrisome. I know it is very hard to diagnosis something of this nature sight unseen, but can anyone offer me some insight as to what it could be? I was just tested for all STD's a few weeks ago and I am clean across the board... thank you very much for your time.
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