My wife sallowed a very small piece of steel wool which might have fallen wrongly inside a burger that we had ordered yesterday. After swallowing the piece of the steel wool she understood that something was stuck in her throat and then she had to insert her finger right up till there to take it out finally. But in this process she might have scratched her throat from the inside. It has started to pain a bit from yesterday night onwards. Does she require any tetanus injections or any other medication or will it heal on its own?