If I take antifungals while waiting for my appointment, would it be harmful or would it not make a difference unless it's, for example, a yeast infection?

It is generally safe to use over-the-counter antifungal treatments while waiting for a doctor's appointment, as long as it does not delay seeking medical care. It is important to consult a healthcare professional to properly diagnose and treat any underlying conditions. Avoid using any soaps or cleansers in the affected area.