Is it mandatory to use sunscreen while using kojic acid?

[Ashoimex]

Hello, i bought kojic acid soap and plan to use it on my face and arms. I already use sunscreen on my face. Do I need to use sunscreen on my arms as well? What will happen if I don’t use it?
How to remove sunscreen when i using kojic acid soap as a cleanser? Should i double cleanse?

 

[Rivers of Nihil]

lmao never use sunscreen

 

[RecessedCels]

You're always supposed to use sunscreen

 

[Ashoimex]

You're always supposed to use sunscreen

I always use on my face. should i use at my arms when im using kojic?