In what circumstances should you NOT perform a chemical treatment on a client?

Performing a chemical treatment on a client with an open wound or skin infection poses significant health risks and should be avoided. Open wounds can lead to the introduction of chemicals into the bloodstream, potentially causing severe irritation or even infection. Additionally, applying chemical treatments to an area of compromised skin can exacerbate existing conditions, leading to increased discomfort for the client and possibly worsening the skin's health. It is critical to prioritize client safety and ensure that the skin is healthy and intact before proceeding with any chemical procedures. This is a fundamental aspect of ethical practice in cosmetology, as protecting the client's well-being is paramount.

In contrast, the other situations, while they may warrant caution and modification of the treatment plan, do not automatically disqualify a client from receiving chemical services. For instance, clients with dry hair may require a moisture treatment before proceeding, and colored hair often just necessitates the use of gentler products or a patch test to ensure compatibility with the existing color. Recently shampooed hair is typically prepared for treatment rather than a contraindication.