An excuse letter is written to inform the school or office the reason of absence. The excuse letter can be written after the leave is taken or prior to the leave that you require. Excuse letter written well in advance shows your professionalism. It has to be neatly drafted and should clearly state the reason of your absence. An excuse letter has to be concise.
The letter should not have additional details. It has to be specific. The tone of the letter should be positive. Date has to be mentioned in the beginning of the letter. In the main body you have to mention the date when you were absent or took a leave.
A Sample Excuse Letter
Date: December 10, 2008
Dear Ms. Roberts:
I was not able to attend office for last three days from December 7 to December 9 2008. I was suffering from viral infection. My physician had advised me rest for three days. I am enclosing the medical certificate issued by the doctor for your perusal.
I'll be finishing The work that is pending, in two to three days. If you want further information, you just let me know. I will be there to answer your queries.
I hope you will consider this application.