What is an important step to take before applying eyelashes?

Testing glue for allergic reactions is a crucial step before applying eyelashes because it addresses safety and client comfort. Many eyelash adhesives contain ingredients that could potentially cause allergic reactions in some individuals. By performing a patch test on a small area of the skin, you can determine if the client has any sensitivity to the glue. This precaution helps prevent adverse effects such as redness, swelling, or irritation, which could lead to more significant complications and client dissatisfaction.

While factors like finding the correct length, applying mascara, and measuring the eyelid are important in the application process, none of these steps directly address the potential health risks associated with the adhesive used. Ensuring that the client does not have an allergic reaction to the glue should always be prioritized to guarantee a safe and pleasant experience during the eyelash application.