Enviroments that is dirty are one of the main cause of acne skin. Our skin one of the biggest organs in our body and most expose to the sun and dirts if not well care acneing of the skin are most commom affected. Skin that is covered with dead cells that is cause by staying in dirty surroning area will tends to look dull and dark.
There are many cosmetic company promoting ingredient that helps to deeply cleance skin and remove that layer of dirt which we didn't realise it existed. Even when our skin suffers sun damage a strong anti-irritants to calm skin and repair complex that builds skin's natural productive barrier to defend itself against external irritants. So take good care of our skin to look beauty and healthy and to avoild acne skin.