As for a background story for my health:
I am a 22 year old woman, and I've never seen anything like this before.
I have had this rash like thing on my leg for about a month now, and it's still just as dark. Infact, the camera didn't even capture exactly how dark it really is. It's more of a brown color, and it seems to follow veins/arteries in my leg. It doesn't seem to hurt until I push down on it a bit, like an old bruise. I figured it would go away after a week or two, but that was two weeks ago.
The only thing I can link to that seems like it was a contributor is a small ceramic space heater I have sitting under my desk to keep my feet warm. I have been using this exact space heater for years, and it has never caused anything like this. The only thing that came to mind was the fact that I was wearing jeans about a month or so ago, and they were not touching the skin. I had not realized that the fabric to my jeans were extremely hot so when I moved it started burning my skin. Wasn't really hot, definitely not hot enough to burn, but it didn't feel great.
I was unsure whether this was a skin condition or some weird blood clot, or something crazy that I will suffer from. I just hope it's not life threatening, or early signs of something serious.