What should patients avoid applying on the affected area after using Ketoconazole?

Patients should avoid applying cosmetics on the affected area after using Ketoconazole because cosmetics can potentially interfere with the medication's effectiveness or cause irritation. Ketoconazole is an antifungal agent that works by inhibiting the growth of fungi, and applying cosmetics may create a barrier that prevents the medication from being absorbed properly or may introduce additional substances that can irritate the skin.

In contrast, water is essential for cleansing the area and does not disrupt the medication's action. Antibiotics, while they can be used to treat bacterial infections, are not typically used in conjunction with antifungal treatments unless specifically directed by a healthcare provider. Sunscreen is important for protection against UV exposure, particularly if the affected area is sensitive or may be exposed to sunlight, and using sunscreen would not affect the action of Ketoconazole. Thus, avoiding cosmetics is pivotal to ensure the antifungal treatment is effective and to prevent any additional skin complications.