Hello. The spots in the attached images do not appear to be similar to a disease or pest attack. Since you mentioned that the affected areas are dry to the touch (not soft in consistency), then most likely the spots appeared after prolonged exposure to strong sunlight. For the time being, it is recommended to maintain constantly the environmental conditions in that space, to respect the care requirements specific to these species (Succulents, plant care and growing guide), and to help the plant to overcome the stress period, as well as for healthy development, you can consider administering a fertilizer rich in beneficial microorganisms, such as , applied by watering, according to the instructions on the product label. In addition, it is recommended to remove decorative pebbles, as they maintain high and constant humidity in the substrate, favoring the installation and propagation of pathogens. Additionally, it is advised to keep an eye on the plant’s growth for a while, and in the case that any other symptoms manifest, we await your message and accompanying images.