Hi, I scratched a small bump on my forearm about four days ago, almost absent mindedly, and it bled pretty good. Was not an obvious bug bite, since I didn t feel anything...my arm just felt slightly itchy. Since then, a lump has formed (approx 1 1/2 to 2 inches in diameter), the skin has gotten thick and hard, is slightly red and warm to the touch. It s not a misquito bite as I know how my body reacts to those. The itching is intermitant and only sometimes maddeningly itchy. Any ideas on what this could be?