the harm of Poor-quality cosmetics to skin

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Hey.Let me tell you the harm of Poor-quality cosmetics to skin We generally used in cosmetic products containing at least moisturizing agents, flavors, soothing agent, because the natural spices, licking with PPD is expensive, so the material has been a synthesis of cosmetics with PPD licking the mainstream, these substances are mostly from oil or Extracted from coal tar, often containing many substances, and the instability of these substances, the exposure to the sun under the decomposition and re-combined into other substances to stimulate the skin to a spot. Or the rapid aging of the skin, so, usually with high-end cosmetics or cosmetics do not have the skin relatively well, often in the middle, using cosmetics, but using cheap, is the most prone to skin problems of a class of people.