Fordyce spots are a cosmetic condition and not associated with any disease or debilitating condition, therefore, yes, you can join the US Arm with fordyce spots.

no

You don't get fordyce spots, you're born with it. They only appear when you hit puberty. I would suggest to speak to a doctor if you have any questions. (fordyce spots aren't an std and you can't pass it on to another person..)

Apparently about 30% of guys get them at some point in their lives. If they are just Fordyce spots and not warts, they are harmless.

yes