2. Injury Injury, excessive heat, or other trauma from accidental cuts or deep scratches may cause blood to fill in clusters of spots on your skin, resulting in red dots called petechia and purpura.

The previous night he noticed a strange rash on his arms and legs, he explained to the physician assistant in the E.R. Tiny red dots. They didn’t hurt or itch — just a bunch of flat dots, like ...

They were just like little blood clots on my arms and legs. In pictures it looks like a rash, like it could be bumps, but it was dots under my skin. I had never had anything like that before.