Do you have a special word in English for the letter of apology written by a parent when a kid misses school, like because he is sick or because of a family emergency? Or because he missed the first hour of school because he overslept?
Then would it be just "a note" or "a note from my/your parents"? Because when we say "mot d'excuse", it's specific to school, so the fact that the parents wrote it is implied. Does it work the same in English, in a school context?
For instance: "You didn't attend my class yesterday. Did you bring a note?"