Can I use skin whitening products after Masseter Jawline Botox?

Hi Doctor's, I have three important questions below. Can I use Hydroquinone, Kocic acid, steroids etc (skin whitening products) after having the Masseter Jawline Botox? Is this safe? Will sagging occur after having the master jawline botox administered once and no longer wanting to continue with the treatments? Does the masseter jawline botox have to be administered for life to retain results? Thank you in advance.

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