I wouldn't worry too much about it. Maybe you could ask an English prof who knows your writing to write you an LOR and to emphasize that you are a good writer. But even if you don't have a resource like that, it shouldn't hurt you.
I got an L! Hello brothers! The consensus is that this happens quite often and US med schools do not care, as long as you're doing good in your english classes and your PS is readable.
I wouldn't worry too much about it. Maybe you could ask an English prof who knows your writing to write you an LOR and to emphasize that you are a good writer. But even if you don't have a resource
like that, it shouldn't hurt you.