Microdermals vs. Skindivers vs. Surface Bars
Where can you get a microdermal? Anywhere!
Microdermals (often shortened to dermals) go under the skin - so the sky's the limit with these guys. When picking a spot, you should consider things that might snag it - clothes, purses, seat belts. It'll surprise you how many things touch you through out the day.
So how do they work? Your piercer will start by either making a small pocket under your skin with a needle or using a biopsy punch. Next, they'll insert the jewelry. A microdermal has two feet that sit under the skin. From there, they'll wrap it up - your microdermal is at risk of falling out while it heals, so be careful! Please only get microdermals from professional body piercers - this information is not meant as a diy guide.
So how does this differ from the skin diver ? They're pretty much the same thing, but a skin diver is one solid piece, while a microdermal has a threaded post. This means you can unscrew the top and change it.
What's better: Microdermals, skindivers, or surface bars?
Microdermals and skin divers are replacing surface bars for piercings in unlikely places. A few years ago, you might have gotten a surface piercing on your nape. Now you're more likely to get a pair of microdermals in that spot.
Some piercers outright refuse to use surface bars. Surface bars are straight with bends at either end - usually at a 45 or 90 degree angle with threading for beads. They're more likely to reject and leave bigger scars. With that said, surface piercings are still HUGE. A couple examples you'll recognize? Belly button and eyebrow piercings are the most popular. Regardless of which you opt for, make sure your piercer is using implant grade jewelry - anything less can breakdown in your body.