What should clients be advised to do before undergoing chemical treatments?

Clients should be advised to consult with a medical professional about their skin conditions before undergoing chemical treatments because this ensures their safety and the effectiveness of the treatment. Knowing an individual's specific skin type, sensitivities, or any underlying conditions is crucial for determining the appropriateness of a chemical treatment. A medical professional can provide relevant information and recommendations that can help in selecting the best treatment options while minimizing the risk of adverse reactions or complications.

Considering prior treatments is essential as well, but it's ultimately the professional advice regarding skin conditions that should guide the client's decisions. A spa visit might offer relaxation, but it wouldn't provide the necessary medical insight. Disregarding previous treatments could lead to complications if the skin has been sensitized or altered, and making decisions based solely on advertisements may result in choices that are not aligned with the client’s individual needs or conditions.