pregnancy and skins

Kristyanne
Hi all mummy out there ok so I'm from Australia so it's hot I have this weird patching on my face my doctor says is normal and my mum said it's a pregnancy mask :( the last few days it's been extremely hot and it's gone so dark it makes my face look dirty even my older kids have asked if I should get it checked lol 
Anyone found away to lighten the mask or get ride of it