It can take months and months for the superficial nerves at an impact sight to heal. As they do heal, they can feel tender.

When recovering for a concussion, it is VERY helpful to go with the flow. Various aches, pains and odd sensations do not mean anything unless they are severe. The over-sensitivity to any sensory stimuli makes these issues APPEAR to be much more.

Give yourself a break and try to learn to tolerate and move past this minor issues.