These streaks on a crater wall are likely caused by boulders that succumbed to gravity and disturbed the surface to expose the darker material underneath. As we can see from the image, the darker streaks will fade in time and disappear.

ID: ESP_054877_1735
date: 11 April 2018
altitude: 267 km

https://uahirise.org/hipod/ESP_054877_1735
NASA/JPL-Caltech/UArizona
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