What Are The Side Effects Of Using Skin Lightening?

I used skin lite almost for an year n i m still using it n my skin looks good but after I heard about side effects I m scared. I don't know what to do? Please suggest something. I used to get regular facial n veg peel. Will it held me any way. From yesterday I m using skin lite only for an hour because I heard it should not be stopped immediately so I have redused n m using for an hour. What do I do? Can I shift to mela glow? Does it have any side effects? Pls help.