I had a guy the other day with a line of them on his forskin, as I've only seen them round the head I wasn't sure if they were the same thing. I was trying to get a good inspection before performing oral on him, without looking too much like I was scrutinising it!
Looking at the pictures they were definitely the same thing, I must say I've seen them a lot more on younger guys, clients and boyfriends under 40, so don't know if they disappear after a while.