Can I use tretinoin on body safely?

I care to rejuvenate the skin on thighs, knees, arms, forearms, and buttocks and diminish the appearance of stretchmarks. Can I achieve either? Should I stick to 0.025 and 0.05 and tiny amounts? Is generic tretinoin safe? I've purchased retino-a, J&J,janssen's, which the packaging says. Thank you.

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