Final answer:
The statement is true; wax should not be heated in the microwave or on a stovetop as it can easily become too hot and burn the skin. Wax should be heated in a dedicated wax heater that controls the temperature to avoid burns.
Step-by-step explanation:
The statement Never heat wax in the microwave or on a stovetop, because it could burn the client's skin is True. Excessively heated wax can easily exceed the safe temperature for application to the skin, which increases the risk of burns. Wax intended for use on the skin should be heated according to the manufacturer's instructions, usually in a dedicated wax heater, which controls the temperature to ensure it doesn't get too hot.
Additionally, as a general safety reminder, one should always be cautious when handling hot substances or containers that have been heated, such as a beaker of hot water. Physical contact with these can cause serious burns, as the warning advises: Do not touch the beaker with your hands, you will burn yourself.