Time. The skin is fresh and therefore a different colour to your natural complexion. It can take anywhere from 1-3 months for that area to completely heal and return back to normal without scarring. Try to keep the area moisturised and use Vitamin E Oil, or a Scar Serum to prevent post inflammatory hyperpigmentation. I don't quite understand what you mean by excess skin, but don't pick at it, all should be fine.