Dear Redbean, If the burning is on the surface of the skin this is not an uncommon sensation after surgery and will take some time to resolve. The healing process from surgery can vary from person to person. Usually there should be improvement in the symptoms as time goes by and it may persist over a couple of months.
If this burning sensation is deeper in your chest there is a concern whether it might be cardiac (heart) related. In this case make sure you’ve discussed this with your physician so you can be further evaluated