They had some fun on the first day of classes at Ronald Reagan Elementary School in New Berlin.

4th grade teacher Gary Hetzel allowed a student to shave his head to raise awareness about Alopecia.

It's a disease of the auto immune system that causes hair to fall out.

The student doing the shaving recently was diagnosed and the shaving kicks off the effort to raise money and awareness.

Alopecia areata is a prevalent autoimmune skin disease resulting in the loss of hair on the scalp and elsewhere on the body.

Several well-known celebrities and athletes have alopecia areata, including former Milwaukee Bucks star Charlie Villanueva. 

"The first day of school is always exciting, and this one should be extra special," Ronald Reagan principal Brady Reinke said. "We are proud to help raise awareness not only for our student, but for all of those who suffer from alopecia areata."