I've noticed this on my leg this evening.
It's not itchy, doesn't feel hot and I only really noticed it because it feels as though the area is sunburnt.
I have absolutely no clue what it is though. Had no recent cuts to get infected. Haven't shaved my legs in a while either (as you can probably see
.)
I don't feel sick in myself (apart from a cold I've had for a while.)
The only thing that's really concerning me is the ring around it. I have drawn around the edge in biro so I'll see if it spreads but until then, anyone have any ideas?