Hello, I am 17 and last night was receiving a hand job when my girlfriend noticed a small lump that suddenly emerged on the bottom of my penis. It is on the bottom about halfway down the shaft, its dome shaped, about a quarter of an inch in size, and it is maybe very slightly discolored pink. It is not painful, at least thus far, but I'm not sure what it is and if it will go away naturally. Thank you for any assistance here

The only proper answer here is : go an see your physician.

Continuation: I've been attempting to do research and my only guess is it might be clot (thrombosis) in penile lymphatics, but I am unsure, has anyone had this before/ agree with my guess?

The internet has done wonders.

The small lump could be many different things: it could simply be an irritation on the skin... but it could also be a result of an std.

As far as the thrombosis, it is possible. I suggest you go see a doc, but as many people on this site, they choose not to. If that's the case, I suggest you refrain from sexual activities until it goes away and you find out what it is.

Please see your doctor about this. It could be nothing, it could be something serious.