Nike free 5.0 7y ( fits size women 8-8.5)

I wear a size 8-8.5 on nikes and these fit just fine. There is dark spot on the front left one. I just got these out of the washer and the dark mark did not seem to come out. It’s not terribly noticeable in my opinion ( see pictures) they are in good condition nice and clean for their next new home!