Dear Professor ______,
Hello, this is Weizing Lee from your ___ class. I’m very sorry I could not make it to Wednesday’s class to take the midterm exam scheduled that day. I was not feeling well and had to go to the doctor’s for a checkup. If possible, I would gladly appreciate if you could meet with me after tomorrow’s class to discuss a time in which I could make up this exam. I will bring in a doctor’s note as proof and I look forward to seeing you then. Thank you for taking the time out of your day to read my email. Have a nice day.