Actually pretty easy to fix. Find yourself the closest matching stain, remember you can mix stain colors to get even closer. Lay enough stain on the area to get the right concentration, then let it dry, really dry (at least 24 hours). Get some CA (crazy glue) and start building up the spot with layer after layer, letting each one dry. Build it up till it's filled higher than the surrounding clear, then wet sand it flush, polish, enjoy
