Can I use melarase am and pm beside pigmentation?

I'm 21 yrs old and i have a baby who is one yr old. I excatly don't know my skin problems but my skin is loosing its fairness and its elasticity. My whole body is loosing its original tone. Its ruining my beauty and i'm so worried. I don't know why and how its happening. Can i get any suggestions? Is it safe for me to use melarase am and pm? Does it have any side effects? If its not appropriate for me to use then can you give me any other suggestions? Thank you for reading please do reply.

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