Green Tea contains significant antioxidants and anti-bacterial agents. The medicinal properties of tea are attributed to flavonoid phytochemicals called polyphenols. The polyphenols found in tea mainly belong to the subtype called catechins. Green tea has more catechins than black tea (about 25% vs 4%). White tea is almost as rich in catechins as green tea but is different in composition and less well studied. The main catechins in green tea include gallocatechin (GC), epigallocatechin (EGC), epicatechin (EC), and epigallocatechin gallate (EGCG).
The EGCG compounds in green tea 
can actually reactivate skin cells that are dying due to poor lifestyle habits, exposure to sunlight and pollution. Plus, it contains high level of oligomeric proanthocyanidins – OPCs – some of the most powerful antioxidants known to scientists. These antioxidants help ward off premature aging by fighting free radicals and healing damaged cells. And that’s not all: OPCs also inhibit the enzymes that break down collagen and elastin, which are essential for skin’s strength and suppleness. Green tea may inhibit matrix metalloproteinases (MMP), the enzymes whose excessive activity contributes to age-related degradation of the skin matrix. In a 2009 in vitro (test tube) study, green tea extract was shown to inhibit two key subtypes of MMP, collagenase and elastase.
The catechins in green tea are anti-bacterial agents that suppress acne-causing bacteria and help regulate hormonal imbalances. It also possesses potent anti-inflammatory properties that help reduce the redness and inflammation brought about by zits, thereby helping them heal the scars.