[Skin concerns] My neck and arms are tanned due to sun exposure, what can do I do to even out my skin color (fade the tan out)?

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Hello, My neck and arms (the area that's exposed to the sun when wearing half-sleeved shirts, around the half of my upper arm and downwards to my hands). I've been applying sunscreen for the past couple months and started wearing long-sleeved shirts and the tan slightly faded out, but the issue is that the tan is pretty bad so it's fading out REALLY slowly, and my skin is normal/dry which apparently contributes to the cell regrowth speed.I've been reading around the subreddit for awhile and my guess would be to start using exfoliants for the parts that arent exposed to the sun? Is that going to be helpful? and if that's a feasible option, what are some good exfoliant recommendations for dry/normal skin?Also are there any supplemental vitamins/etc that I could take to help encourage skin cells regrowth to speed up the process?Also this is unrelated to my main "concern", but I also have keratosis pilaris (AKA chicken skin), are there anything I could do to help with that as well?Thanks in advance!
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Submitted by paioss