How to Write Leave Applications to Your School Principal?

To,
The Headmaster,
(School Name)
(Address)

Sir,

This is to kindly request you to grant my son ____________ (Son name) a student of class ____________, Section ____________, of your school leave for ____________ (No of days) He is down with high fever and has been advised complete rest by the doctor. I shall be much obliged.

Thanking you,

Yours faithfully,
(Your Name)

How to Write Leave Applications to Your School Principal?