You have to perform emergency first-aid treatment on your succulent. Please read these procedures carefully. Step 1: Cut out the parts of the succulent that are rotting or showing discoloration such as the leaves and parts of the stem with a sterilized and sharpened knife or a pair of garden shears. Step 2: Remove the succulent from the soil. Shake off the excess soil and cut out the roots that are rotting. Step 3: Re-plant the succulent in a new terra cotta pot that is filled with fresh, well-draining soil.