Which of the following is a proper action to take if a client has a reaction during a lash service?

Seeking immediate medical attention for the client is the appropriate action to take if a client has a reaction during a lash service. When a client shows signs of an adverse reaction—such as swelling, redness, itching, or difficulty breathing—it is crucial to prioritize their health and safety. Prompt medical attention can help address any potential complications, especially if the reaction is severe or indicates an allergic response.

Medical professionals are equipped to provide the necessary care and treatment, which may not be within the scope of practice for a lash technician. By taking this action, you ensure that the client receives proper evaluation and intervention, possibly preventing further health issues.

This response emphasizes the importance of acting responsibly and protecting the wellbeing of clients during aesthetic procedures.