The areas you circled just look like a little bumps it might have experienced. These plants lose leaves at the base as they grow and age, and these leaves should be left to dry up on their own, when they can be easily removed.

You can educate yourself about succulent care by reading other posts here. When purchasing new plants, I usually repot them in the same pot (or maybe slightly larger if the roots are filling the original pot) with fresh potting mix. Remove all the potting mix from the roots and use fresh potting mix, commercial cactus and succulent mix combined 50-50 with perlite or pumice from your nursery. Make sure your plant gets plenty of light every day. Water and let it run out the bottom holes when plant is dry. The most common succulent problems and killers are lack of light and too much water. If you keep those in mind, you’ll be fine.