Small pimple like wounds inside penis skin at top

So I have been with my girlfriend for about 8 months and I know she's been tested, and I was tested this past July and came out clean. I don't have too much of a sexual history aside from with her, and we haven't had sex for about a month now. A few weeks ago, I noticed a small raised pimple-like...

I have a small pimple on the underside of my penis. I t does not hurt or anything. I t is just something I thing should not be there. What could have caused it?

I'm 16 and I've had two maybe 3 pimples on my penis(all at different times). This 3rd is bigger than the others though and it hurts whenever I touch it. I had sex only once and I wore a condum. It doesn't look like any of the pictures of gential herpes, or warts. It looks like a pimple you would...

I am a bit concerned to say the least, I recently noticed in the past three days, a pimple on the top center of the shaft of the penis, it doesn't hurt whatsoever, its just a small pimple with a tiny whitehead. I'm 45 years old and have a new girlfriend that I have to explain this too. Any advice...

So as of today (i would have noticed this before today I like to look at it lol) I noticed a very small lump, dark colored/purpleish lump under the skin of my penis near the tip, but on the shaft. If you take a normal pen and look at the tip of it, the metal piece, its about half that size maybe...