Bumps on arm and fingers

Hey there!
I was traveling in Thailand and beaching it every day (wearing sunscreen) and one day I noticed on my left arm, on the outside of the elbow sort of area, was a bump. It was small, reddish but skin-colored, and shiny. It appeared almost as a pimple of some kind. It didn't go away for weeks, and so when I was back in the US I went to a dermatologist; she cut it off and set it away for a biopsy, and when the results came back, she said "we don't know what it is". Good, I guess, as that means it wasn't cancerous, but still...unknown bump?

Just last week I noticed the SAME bump, this time on my left wrist. Small, skin-colored bump with a hint of reddish coloring, which is somewhat shiny. It doesn't hurt, itch or cause any discomfort at all. Doesn't seem to get bigger or smaller, it just is THERE.

Then today I noticed MORE bumps- these on the ring finger and pinky of my left hand. The ones on my pinky appear to be TWO bumps together, while the one on my ringfinger is singular, like the one on my wrist. They don't hurt, itch or anything else. They're very strange.

I have NO idea what these are. They don't seem like warts, they don't pop or have pus like pimples, they don't go away like heat rash, they don't hurt, they don't itch (like bug bites or plants like poison ivy, etc) and they don't seem to go away.

I'm just wondering if anyone here has IDEAS. Maybe thoughts as to what they COULD be, and how to get rid of them. Where the dermatologist cut the first one off has left a scar, so I'm looking for other options, but will consider anything...

Thanks!