Some succulents have delicate leaves that are easily marked by handling, particularly Aeonium. These varieties are labeled with [shipping issues] right after the plant name. Abrasions are permanent, but over time the succulent will grow new leaves and shed the old.
Raised, white abrasions can be an indicator of edema. Edema is the result of overwatering or an irregular watering schedule. A plant cannot heal existing edema scars, but you can reduce watering frequency and maintain regular intervals of drought to prevent edema in new leaves.