What are the facts about hydroquinone products?

What must one know about hydroquinone products? Do they really whiten the skin? What is hydroquinone present in? Which are the famous products which have this chemical or substance which is supposed to whiten the skin? How does hydroquinone products work for the skin, what is the procedure it takes to lighten your skin tone? Is the product which contains hydroquinone really safe on the long run? Are there any side effects one must know about?

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