How can I prevent/get rid of the dark spots on my stomach from abdominal surgery and pregnancy dark spots? (photo)

I have had 3 abdominal surgeries since birth and the 3rd and most recent one is the only one that has left me in rashes and dark spots, I believe it also has to do with the pregnancy. I have been using Shea butter to help with stretching and the spots, however if there is anything else I can do please let me know, thanks.

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