What should a nail technician do if a client has a history of allergic reactions?

Conducting a patch test is the most appropriate action for a nail technician to take if a client has a history of allergic reactions. A patch test involves applying a small amount of the product to a discreet area of the skin to observe for any adverse reactions before proceeding with the full service. This step is critical in ensuring the client's safety and comfort, as it helps identify potential allergies or sensitivities to specific products used during nail services.

The rationale for this approach lies in the importance of client health and safety in the cosmetology field. By performing a patch test, the technician can gather valuable information about how the client's skin may react, allowing for informed decisions about the products and services offered. If no reaction occurs after a set amount of time, it can be safer to proceed, whereas any adverse reaction may prompt the technician to reconsider the used products or suggest alternative options.

Other choices may lack the necessary precautionary measures that ensure a safe and positive experience for the client.