(CNN) - It's officially "Movember!"
Men all over the world are growing out their mustaches to raise awareness about men's health.
Participants start clean shaven on November 1st and grow their mustaches for the entire month.
Last year, the campaign raised over $15 million for men's health.
Movember was started in 2003 in Australia and made its way to the US in 2007.
Organizers say 21 countries will participate this year.