Forehead injury not healing

Good Morning, my question is--why has my forehead never healed after an injury? This is not the first incident of me not healing properly and I have done a lot of research but am still uncertain.  If you could please read the rest & provide any advice, I would greatly appreciate it.

Quick Background (Directly related):
-I had bumped foreheads with someone in '08' and was left with swelling in the middle of my forehead that never went away & I never had that looked at due to no subsequent issues.
-10 days ago, I was hit really hard in the forehead (open handed) by an 8 yr old that I work with (I work with children who have behavioral issues). I had my glasses on at the time and I was left with A LOT of swelling..again not just a bump but the entire area, primarily the bone over my eyebrows that now protrudes a great deal. However, I have no more tenderness and only slight discoloration by eyes and nose. I was seen by the work clinic and an X-Ray was taken the day after. The X-Ray was clean and I had iced every hour for the first 5 days.

Quick Background (Other issues):
-I have had 2 concussions in the past 5 yrs.
-In '05' I had knocked the left side of my face at the top of my cheek bone and the swelling never went down.
-Recently the back of my skull felt diminished in size & I was told I have a severe Vitamin D deficiency.
*I started seeing a neurologist again about 2 months ago (so before this forehead injury) and had just gotten and MRI of the brain done the morning before the injury...some luck, huh? The MRI was clean and I am waiting for more answers and to tell my neuro. about this injury now.