Do I need a Macau visa?

I am from india and visiting hong kong, then i have to go to shenzen for which i allready have one to china, from shenzen i am planning to go to macau, then i have a flight back to india from hong kong. So the question is do i need a macau's while having hong kong one? And while flying back i need to re enter hong kong. So do i need to apply hk one again?