How do you fix a burn within wood? I have a built within desk and a cigarette burned a round...

I have a built within desk and a cigarette burned a round black mark contained by it. I think the wood is oak near a satin finish. I don¡¯t want to mess it up.
Answers:    If the burn isn't too deep after you can clean it up and refinish it. If the burn is low then you want a "Dutchman" inlay to replace the burnt wood.
If your lucky you a short time ago burned the finish and not the wood. Try to gently sand the burn spot and solitary the burn spot. Use the finest grit paper or wad. Then feather several strong layers of finish fund on