• Sidharth Sonthalia, Archana Singal, and Shukla Das.
• SKINNOCENCE: The Skin Clinic & Research Centre, Haryana, IndiaDepartments of Dermatology and STD and Microbiology, University College of Medical Sciences and Guru Teg Bahadur Hospital, University of Delhi, Delhi, India.
• J Cutan Med Surg. 2015 Mar 1; 19 (2): 171-6.

BackgroundTinea indecisiva is characterized by concentric scaly rings simulating tinea imbricata but caused by dermatophytes other than Trichophyton concentricum.ObjectiveTinea indecisiva has been rarely reported. We report a unique case and review of the previously reported cases, pathogenesis, and management.MethodsAn adult Indian man developed extensive tinea cruris and tinea corporis with concentric rings of scaly lesions over the groin, buttocks, and thighs following the use of oral corticosteroids and antifungal-steroid cream for 3 months. Mycologic and immunologic studies were performed for diagnosis.ResultsDiagnosis of tinea indecisiva was confirmed on the appearance of "ring-within-a-ring" lesions clinically and isolation of Trichophyton mentagrophytes var. interdigitale as the etiologic agent on mycologic testing. Intradermal testing with Trichophyton extract showed fluctuating hypersensitivity responses. Four-week treatment with daily oral terbinafine resulted in complete resolution.ConclusionTinea indecisiva should be considered in a patient with tinea imbricata-like lesions with local immunosuppression caused by a non-concentricum dermatophyte.© 2014 Canadian Dermatology Association.

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