Oh my gosh these are the latest trend among skanky girls.
They are essentially just surface piercings in those grooves people have on their lower back. I don't seem to have them, maybe it's a birth defect??
What is so strange is that when I was younger these type of girls used to belittle people who looked different and had piercings. Now that there favorite stars are doing this, they have jumped on the band wagon in a really skanky way.
Want evidece? Here we go:
(most of these are from Tumblr by the way)
Here's a video of someone getting the procedure done: