about a week ago, I got a small cut just under my knee when shaving. It was just mildly tender for a few days. What you would expect from a small cut. Then two days ago, I noticed more tenderness. Yesterday, there was a small whitehead, which I drained. Since then, it has become more and more red, firm, and extremely tender. It is now about 5 inches in diameter (the original cut was tiny). I drew a line around it and the redness is spreading beyond the borders. No fever. I hate to go to urgent care for nothing, but wondering if this is something I should be concerned enough about to go to urgent care this evening after work. Wait and see? or get it checked?