What is the appropriate action if a client shows signs of an allergic reaction during a nail service?

When a client shows signs of an allergic reaction during a nail service, the appropriate action is to stop the service and seek assistance. This response is crucial for the client's safety and well-being. Signs of an allergic reaction may include redness, swelling, itching, or difficulty breathing, which can escalate quickly if not addressed properly.

Stopping the service immediately helps to prevent further exposure to the allergen and allows for the client to receive the necessary attention. It's essential to assess the severity of the allergic reaction and provide appropriate care, which may include contacting medical personnel or providing the client with an anxiety-reducing environment until help arrives.

Continuing with the service while monitoring could worsen the reaction, and applying more product could exacerbate the symptoms. Offering a drink of water, while potentially soothing for some situations, does not address the core issue of an allergic reaction and is not a suitable response in this context. Prioritizing the client's health and safety by halting the service is the best course of action.