It's because he hates growing facial hair that he used a fake beard in Kites.
However, Bhansali didn't allow him to use a fake beard. As it was a Bhansali film, he agreed to grow a beard. However, he is waiting for the shooting to get over soon so that he can shave again, even though some of his friends like his new look and complimented him for it.
Hrithik, although a little eager to shave, is happy he devoted time to ‘Guzaarish' and gave it bulk dates. The film is expected finish shooting at the end of this year.