What should be done if a client experiences a delayed allergic reaction?

When a client experiences a delayed allergic reaction, referring the client to a physician is the most appropriate course of action. This ensures that the client receives professional medical evaluation and treatment for any potential complications. Delayed allergic reactions can lead to symptoms that may require specific interventions, and a physician is equipped to identify the severity of the allergy and recommend the right treatment.

Monitoring the client's condition is important, but it should be done with professional oversight. A physician can provide a definitive diagnosis and determine if any further action is necessary, thus ensuring the client's safety and well-being. The other options imply either continuing treatment or managing the reaction without professional advice, which could be risky. Therefore, referring to a physician reinforces the principles of safety and best practice in a professional aesthetic setting.