HOW EFFECTIVE IS FACE MASK IN REDUCING RISK COVID-19?

Are face masks really effective in reducing the risk of being contaminated ?

Generally, no. If you have COVID-19, then, yes, wearing a mask should reduce the risk of you giving it to someone else. 

But if you're otherwise healthy, surgical masks provide little protection and the more sophisticated N95 masks are best left to health care workers, who are often fitted for them. Many people who wear either mask often do not do so properly -- they continue to touch their face or adjust the masks, which can actually increase the risk of getting infected. You also have to dispose of it carefully. They are also not reusable, so as soon as you touch your face or adjust the mask, or take it off once you get inside somewhere safe, you can't put it back on. 

If you are around someone sick, the mask can, however, block droplets and "splash" from a cough or sneeze. 

The best thing to do continues to be to wash your hands and to try not to touch your face, eyes, nose, or mouth.