A 28-year-old woman presents with a well-demarcated, scaly, erythematous patch on her left groin and inner thigh for 4 weeks. She reports mild pruritus and denies systemic symptoms. KOH preparation shows branching septate hyphae. She has been applying topical miconazole 2% cream twice daily for 2 weeks with good clinical response. What is the most appropriate next step?