In the short term nothing to worry about. But rust has a habit of spreading and it is better to stop it from getting any worse. I have used a product called "rust converter" for many years with excellent results. It is a chemical that is applied straight on rust (do not clean the rust before applying). It goes on white and over the next few hours the chemical goes black indicating that it has done it work.
I found this online for you. I have not used this particular brand but my guess is that it works the same: https://www.toolsmart.pk/products/rust-converter
If memory serves, rust is Iron oxide. This chemical converts iron oxide to iron phosphate or some such product.