A 16-year-old with a two-week pruritic rash has not improved with OTC hydrocortisone 0.5%. Which topical therapy is most appropriate to prescribe?

A 16-year-old with a two-week pruritic rash has not improved with OTC hydrocortisone 0.5%. Which topical therapy is most appropriate to prescribe?

• A. Clotrimazole
• B. Hydrocortisone again
• C. Mometasone
• D. Clobetasol

Answer: (A)

When a pruritic rash doesn’t improve with a low-potency topical steroid, the likely issue is a fungal infection rather than ongoing inflammation alone. Steroids reduce itching and inflammation but don’t eradicate fungi; continuing steroids can even mask symptoms and allow the infection to persist or spread. Clotrimazole is an antifungal that treats superficial fungal infections such as tinea corporis. It works by disrupting fungal cell membranes, addressing the underlying cause of the rash rather than just the itch. For a teenager with a two-week history of a pruritic rash not helped by hydrocortisone, starting an antifungal like clotrimazole targets the probable infection directly and is the most appropriate next step. Using another steroid (even a stronger one) won’t resolve the fungal infection and can increase risk of side effects or worsen the condition. A stronger steroid like clobetasol is not suitable here, and repeating hydrocortisone won’t treat the fungus either. Mometasone could reduce inflammation somewhat but still doesn’t address the fungal etiology, and it isn’t the best first choice when a fungal infection is suspected. If there’s still no improvement after a course of an antifungal, reevaluation and possible testing would be warranted.

When a pruritic rash doesn’t improve with a low-potency topical steroid, the likely issue is a fungal infection rather than ongoing inflammation alone. Steroids reduce itching and inflammation but don’t eradicate fungi; continuing steroids can even mask symptoms and allow the infection to persist or spread.

Clotrimazole is an antifungal that treats superficial fungal infections such as tinea corporis. It works by disrupting fungal cell membranes, addressing the underlying cause of the rash rather than just the itch. For a teenager with a two-week history of a pruritic rash not helped by hydrocortisone, starting an antifungal like clotrimazole targets the probable infection directly and is the most appropriate next step.

Using another steroid (even a stronger one) won’t resolve the fungal infection and can increase risk of side effects or worsen the condition. A stronger steroid like clobetasol is not suitable here, and repeating hydrocortisone won’t treat the fungus either. Mometasone could reduce inflammation somewhat but still doesn’t address the fungal etiology, and it isn’t the best first choice when a fungal infection is suspected. If there’s still no improvement after a course of an antifungal, reevaluation and possible testing would be warranted.