Do I Need to Apply Sunscreen While on Retin-a Treatment Even if I Am at Home for the Entire Day?

do i need to apply sunscreen while on retin-a treatment even if i am at home for the entire day? and for the other days that i do go out i feel a bit of irritation and redness though not dryness cause i have an oily should i use some moisturizers containing skin soothing elements like aloe vera before applying sunscreen going ?

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