I have had a little white oval shaped lump on the underneath side of my penis, just below the head bit. It has been fine until a couple days ago when it suddenly got a whole lot bigger. It hurts a little bit but hurts quite a bit when I touch it. Pleas help,
Anyone?
:(

It sounds like you need to go to your doctor. No one here would be acting responsibly by providing you with a possible diagnosis without actually seeing you first. We can give you ideas and places where you might look for information. But really, in order for you to not keep on wondering and guessing about what it is, the best thing for you would be to go to your doctor.

There are links on the bottom of this page to questions that have been similar to yours. You might like to click on them to see what information might be on them.

You might also consider clicking on the following search. Lump on Underside of Penis - Google Search

I do hope that it is nothing serious.