Forehead bone void after brow bossing reduction? (Photos)

3.5 months ago I had brow bossing reduction surgery outside the US, involving the removal of my frontal sinus plate. 3 weeks ago I noticed a bone void near my right eye, approx 5 mm deep. For now I experience no discomfort other than the emotional distress this is causing me. My hope is that it is medically possible to inject a bone paste into the void or possibly even insert an implant by entering through my eyebrow. I fear that I'll have to undergo another invasive surgery like my last one.