No, these aren’t blisters, but a group of small craters with layered deposits. They seem to have contact with a higher, smoother unit. These craters may be secondary craters as they are in a tight bunch.

ID: ESP_054921_2215
date: 14 April 2018
altitude: 296 km

https://uahirise.org/hipod/ESP_054921_2215
NASA/JPL-Caltech/UArizona
#Mars #science #NASA