This may be covered by an answer below. But my recent swelling and redness is not precisely on a scar. The scar resulted from a bicycle accident two years ago -- 81 stitches on my forehead. One end of the trident-shaped scar ended up just above my eyebrow. Since the injury healed, I've felt what seems like a dent in that ridge of bone, under the eyebrow. Every once in a while it has swollen up a very small bit, then gone away. But this time it's been going on for four or five days, swollen and sore like a bruise, my eye almost squeezed shut when I wake in the AM. Is it possible I had a bone bruise that is acting up...two years later?