ZO Skin or Kareskin for stubborn postinflammatory hyperpigmentation?

I posted a question about treating postinflammatory hyperpigmentation scars. I've had some of these scars/dark marks for years now. Doctors suggested both the ZO skin products (like Melamin) and the Kareskin Melarse products. Before I invest in either, I'd like to know which line of products is more effective in treating dark brown PIH scars/discolorations on brown skin. Thank you.

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