This is the second time I got this bump on my arm, at 1st it was small but has gotten bigger as the days go. My entire tricep is red and ichty, its firm to the touch. It looked like a bite at 1st but then disappeared as it redden. I been waking up with this on my arm. Don't seem to be bug bugs since my mattress is fairly new. It would be a single red bump and they get bigger. Any thoughs