Which statement by a client receiving tretinoin (Retin-A) indicates a need for further instruction?

The statement regarding the application of a very thin layer of tretinoin indicates a need for further instruction because while it is correct that a thin layer should be applied, the emphasis in the context of the question may relate to the method of application and the amount used. Tretinoin is indeed most effective when used in moderation; however, it’s crucial for the client to understand that excessive application will not yield faster results and could increase the risk of irritation.

The medication is generally used once daily in the evening on clean, dry skin, and applying a thin layer is necessary to avoid irritation, but the focus should include details on ensuring that the layer is adequately distributed rather than just limiting to thinness. Furthermore, reassuring the client about the timeline for optimal results, effective cleansing of the skin beforehand, and proper hygiene such as washing hands after application are practices that demonstrate safe and effective usage of the medication, illustrating a need for clear instructions on its application and expected outcomes.