Final answer:
The type of skin that you would not use a suction machine on is damaged or broken skin. It is important to only use a suction machine on intact and healthy skin surfaces.
Step-by-step explanation:
The type of skin that you would not use a suction machine on is damaged or broken skin. A suction machine is typically used to remove excess fluids or secretions from the body's external surfaces. However, using a suction machine on damaged or broken skin can potentially cause further injury or infection.
For example, if a person has an open wound or a severe rash on their skin, using a suction machine in that area could disrupt the healing process or introduce bacteria into the wound.
Therefore, it is important to only use a suction machine on intact and healthy skin surfaces.