[marshmallow10]

I was reading another thread and it got me thinking about something that happened to me about a year ago. One day I discovered this perfect triangle on my skin, located just below my left collar bone but on the side closer to my shoulder. I thought it was unusual because it was so perfect, it was made up of tiny pin sized dots. I didn't count them because they were quite small, but I estimate each line of the triangle was made up of around 15 or so dots. My first thought was some sort of bug (maybe with OCD lol), but I had no other marks. The dots weren't raise, or itchy, or painful. They were flat and a purplish color, almost like a tattoo.

It stayed for around a week, and then one day it was gone. After that I just put it out of my mind. Now I'm curious again. There could be a perfectly logical explanation for it, but just because of the shape and how suddenly it appeared with no other dots anywhere else, it does seem strange. Any ideas?