Mequinol 5% with Tretinoin 0.01% to Lighten the Skin Safe?

I am currently using mequinol 5% and tretinoin that I have been able to obtain and have tested for purity. I would like to know how safe is it to use mequinol 5%/tretinoin 0.01% to lighten the entire face and body 2-3 shades lighter? And how should I maintain the results?

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