how do you use kojic soap

[young_sheldon]

I bought Kojic soap, but i deadass don't know how to use it. Should i use it in the shower or what?
and how long should i keep the it on my face be for washing it off

 

[haiq]

It’s a potent tyrosinase inhibitor that shuts down melanin production to clear mltn marks. Don't rub the raw bar on your face or leave it on for 5 minutes hoping for faster results—you'll just get chemical burns. Lather it in your hands and leave the foam on your face for 60 seconds max. It completely strips your lipid barrier, so apply a thick ceramide moisturizer right after washing it off. Kojic makes your skin insanely photosensitive, so if you step in the sun without SPF 50+, UV rays will permanently darken your spots. Start using it 2x a week at night to build tolerance.