Red Bump On Arm That Does Not Itch. Any Idea?

One week ago, I noticed a pink-red mark on my arm that honestly was shaped like the state of Florida. It didn't itch, didn't have any bumps, wasn't raised in any way, and was localized to the one small part on the underside of my forearm. A few days later, a white/clear raised pustule appeared and the spot still was surrounded by a red/pink mark and still did not itch. Now the mark is a little bumpy/rough and resembles a burn or a scrape from concrete like if you fell off of a bike. The color is now a deeper red and it still does not itch. It is not contagious and is not anywhere else on my body. Two weeks ago, my cornea was also scratched in my sleep. I'm sure its unrelated, but figured I would mention it.