Looks like the black dye on the leather is wearing off. Some beauty products (in particular hand sanitiser which has been a big deal the past 12 months or so with covid) can wear it off prematurely, as well as rough skin and jewellery etc.
When I bought my Mk7 golf about a year ago it had similar wear on the leather. I used a expensive dye kit which visually dye'd the leather black again but it never looked right. I ended up replacing the steering wheel (or you could get it retrimmed).
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