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When a client experiences an allergic reaction to a product during a service, the appropriate course of action is to stop the service immediately and administer first aid. This response is essential because an allergic reaction can escalate quickly, leading to more severe symptoms such as difficulty breathing, swelling, or even anaphylaxis. By ceasing the service right away, you prioritize the client's safety and well-being.

Administering first aid may include washing off the product, applying a cool cloth to the affected area, and monitoring the client’s condition. If necessary, it might also involve recommending that the client seek professional medical assistance, especially if they present with significant symptoms.

Continuing the service or suggesting that the client wash off the reaction later could lead to further complications and discomfort. Changing the product without addressing the reaction could also exacerbate the situation, as the client might react to the new product as well. Thus, stopping the service and providing first aid is the most responsible and ethical choice in the event of an allergic reaction.