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Advising the patient that topical corticosteroid therapy will relieve itching is appropriate in this scenario because corticosteroids are effective anti-inflammatory agents commonly used to soothe pruritic rashes. When a rash worsens, particularly after initiating antifungal treatment, it is important to consider the possibility of an inflammatory reaction or a different underlying condition, such as contact dermatitis or a drug reaction. Topical corticosteroids can help reduce inflammation and alleviate the associated itching, providing symptomatic relief while further evaluation is conducted.

In cases where a rash does not improve or worsens after treatment, it is critical to assess whether the original condition was misdiagnosed, or if there is a secondary reaction to either the antifungal medication or another irritant. Other management options, like avoidance of sun exposure or reassurance that no treatment is needed, may not appropriately address the patient's discomfort or the ongoing issue. Additionally, immediate reliance on systemic corticosteroids may not be necessary and could have potential side effects that are generally not warranted unless there is significant involvement or systemic symptoms. Overall, topical corticosteroids offer a balanced approach to manage symptoms effectively while further investigation into the rash's underlying cause can be conducted.