What yogurt does Lori Harvey use for her face Reduce dark mark ?

Yogurt includes lactic acid, a form of alpha hydroxy acid (AHA), 

 which is primarily why people like Lori apply it on their faces.

Simply said, when you use an AHA on your face, 

 it exfoliates dead skin cells gently while also helping to target "dark marks," 

 commonly known as hyperpigmentation.

Lactic acid helps skin cells shed, which can help fade hyperpigmentation," says Dr. Wong.

It can also make your skin look brighter, smoother, 

and possibly less prone to acne by removing dead skin cells.