Final answer:
Ken should include questions about allergies, adverse reactions, and medical conditions on the client's assessment form for a hair removal treatment.
Step-by-step explanation:
The client assessment form that Ken should use should include the question:
- Do you have any allergies to hair removal products?
- Are you currently taking any medications?
- Have you had any previous adverse reactions to hair removal treatments?
- Do you have any medical conditions that may affect the treatment?
These questions are essential because they help Ken gather important information about the client's allergies, medical history, and previous experiences with hair removal treatments. This information is crucial in ensuring the client's safety and well-being during the treatment.