(NSFW) Small painless bump on boyfriend's 'down there'?

On Memorial Day weekend, my boyfriend accidentally zipped himself in his pants zipper (ouch!). A couple of days later, he noticed a small red bump in that general area. A month and a half later, it’s still there but is now darker. It almost looks like a blackhead with a scab over it. He says he’s tried to pop it but the area is too sensitive for any of that. It’s tiny, you can’t really see it unless you get close, and it’s right on the edge of the head where it meets the shaft.

It doesn’t hurt or itch, it hasn’t popped or anything, it hasn’t gotten bigger, but it worries us because it’s still there. We’re worried that he may have genital warts from one of his sexual partners before me, but when you look up symptoms it basically covers all bumps you could ever get on your genitals. We’re monogamous, and normally I’d never even consider that he’s cheated, but it’s easy for me to freak out over stuff like this—warts, syphilis…I mean, it could be anything. On the other hand, I’m worried about the possibility of penile cancer. I know it’s extremely rare, but I can’t find enough detailed information on it. All the pictures I look up on all of these conditions are really severe. He just has one little bump.

I know it could be nothing and he needs to see a doctor (and he will), but does it sound bad from what I’ve described? Google isn’t doing me any favors here. I know self-diagnosis is a dangerous thing, but it would be nice to find something that isn’t serious like an STD or cancer that it might be.

[Again, I’m not asking for a diagnosis. I’m just asking for my own information from those of you that may have more experience than I do—he’s the only guy I’ve been with.]