It's understandable to be concerned about changes in your skin color after an injury.
Few possibilities for why the skin color has not returned to normal are
1. PIH (post inflammatory hypopigmentation): the skin lightens after an injury. And it take several months to fade.
2. Scarring: minor injuries also leave scars that might be lighter or darker than your surrounding skin.
3.
Vitamin/mineral deficiency: deficiencies in certain vitamins and minerals, like
vitamin D,
Vitamin B12 or iron can affect skin healing and pigmentation.
Given that it's been 2 months and the area hasn't regained its color, seeing a dermat or consult online would be a prudent step. It's important to get a professional evaluation to rule out other conditions . The doctor might recommend topical treatments to help even out the skin tone