What effect could a poorly performed patch test have?

A poorly performed patch test can significantly impact a client's safety, primarily because it may lead to an allergic reaction. Patch tests are designed to determine if a client has sensitivities or allergies to the materials that will be used during the eyelash extension application. If the test is not done correctly, the results could be misleading, causing a technician to proceed with the application without knowing that the client is indeed sensitive to the adhesive or other products.

In such cases, the actual application could trigger an adverse reaction, which could range from mild irritation to severe allergic responses. This risk emphasizes the importance of conducting an accurate patch test, as the health and well-being of the client should always be the top priority in any cosmetic procedure.