About 4 months ago, I developed what appeared to be a bump or pimple above my right eyebrow. It eventually came to a head and broke open and bled after a couple of weeks. Then it was like an open sore or wound for about 2-3 months. The wound closed up but now I have puffiness around where the wound was and some redness around the edges. It doesn't really hurt or itch. I have a dermatology appointment set up. What do you think it is and is there anything to be concerned about?