Taking time for you and your skin is important reduce your congestion and oily - acne skin with doing a clay mask 1-2 times per week. Here's why below: What does green clay do for skin? French green clay is beneficial in removing impurities and tightening the pores, toning the skin, exfoliating dead skin cells and reducing inflammation in acne. It can also be used as a full-body treatment to soften dry, rough skin. - Clay masks are great for acne prone oily skin as the clay draws out the impurities from deep in the pores, which will assist your pores not to be so enlarged.