It could be old retained shed that got trapped by the new skin, and is finally coming off. If the affected area sheds completely and doesn't spread it's probably not a big deal.
Were it my pet, I'd try a gentle soak to see if that area sheds completely and if so not worry about it. There's a chance the white area is a skin infection but those are rather rare. If it doesn't shed completely then you might want to have a vet do a skin culture to see if there's a bacteria, fungus or virus causing the problem but if it sheds fully it's no biggie.
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