Suggest Treatment For Black Marks On Face And Shoulder With Loose Skin

Hello sir, I m Sapna, I am 21 years old But, my skin looks like she s 30 years , My skin is very loose, Please tell me how I can tight my skin. Pimples have fallen very black mark on my face. My shoulders are black stains fallen from 4 years, Doctor says, since the roots of mehendi or hair dye, since a lot like my age. Nobody does not want to marry with me. I have used the cream skinlight But I reaction. Please suggest me. How can I be fair/ How do I fair. My friend advised me to use skinsine. Why should I use skinsine?/Or Can I use Skinshin?please suggest me For my Face or Shoulder Black Marks , & please also suggest me for skin tightening.