Final answer:
During a microdermabrasion treatment, the hyoid bone should be avoided when treating the neck area, due to its vulnerability.
Step-by-step explanation:
When performing a microdermabrasion treatment, it is important to avoid the hyoid bone when working on the neck area. The hyoid bone is a horseshoe-shaped bone situated at the base of the mandible (lower jaw) and at the top of the neck. It's not covered by a thick layer of skin or muscle, making it more vulnerable to pressure and mechanical damage than other areas typically treated with microdermabrasion, such as the cheeks or forehead.