I`ve got 4th gen leather in my car and it has a couple of small spots that look like color transfer from wet clothes.Kinda black and a small worn spot.Not really noticeable but I would still see when i`m getting in the car.It`s on the outside of the driver seat.It`s not worn through the leather nor is it cut,And a really small puncture on the passenger seat.
Anyway is their a leather repair kit that is worth a damn.I`ve found a couple but I dont want to make it worse with a BS product.

 

I've personally used them and I think they are crap. The good ones you gotta buy at a detailing supplies place and that is if they have them.

The ones that detailers use work well but are totally temporary. I have my driver's side seat on my Corvette repaired and it looked great and stayed great for a while but after a years time, it cracked again. The ones for cloth are not that much better either.