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Dermatophytosis — Clinical Guidelines

Overview

Dermatophytosis, commonly known as ringworm, is a fungal infection affecting the skin, hair, and nails, prevalent globally and particularly burdensome in developing countries among pediatric populations 1. It significantly impacts quality of life due to its chronic, recurrent nature 2.

Diagnosis

Clinical Presentation: Characteristic ring-shaped lesions with central clearing 1.

Laboratory Tests: Mycological KOH preparation is a practical initial diagnostic tool 6.

Culture Methods: In-house fungal culture and commercial quantitative PCR show high concordance for diagnosis and monitoring treatment response 3.

DTM Medium: Useful for accurate diagnosis when read by non-mycologists in pediatric settings 11.

Management

First-Line Treatments: Topical antifungals such as terbinafine, clotrimazole, or econazole for mild to moderate cases 1 11.

Systemic Therapy: Oral antifungals like terbinafine, itraconazole, or fluconazole for severe or extensive infections 1 2.

Duration: Treatment typically lasts 4-8 weeks, depending on the severity and site of infection 1.

Monitoring: Regular follow-up cultures to ensure mycological cure 3.

Special Populations

Pediatrics: Frequent misdiagnosis by pediatric house officers; culture methods like DTM medium aid accurate diagnosis 1 11.

Comorbidities: Atopy increases susceptibility in dermatological outpatients with Trichophyton rubrum infections 10.

Key Recommendations

Utilize mycological KOH preparations and fungal cultures for accurate diagnosis of dermatophytosis (Evidence: Moderate 6 3).

Employ topical antifungals for localized infections and systemic therapy for extensive or refractory cases (Evidence: Moderate 1 2).

Monitor treatment response with follow-up cultures to confirm mycological cure (Evidence: Moderate 3).

References

1 Haro M, Alemayehu T, Mikiru A. Dermatophytosis and its risk factors among children visiting dermatology clinic in Hawassa Sidama, Ethiopia. Scientific reports 2023. link 2 Nahid A, Haque ME, Asma AN, Hassan MA, Hassan MK, Chanda T et al.. Dermatology Life Quality Index in Patients with Dermatophytosis in a Tertiary Care Centre of Bangladesh. Mymensingh medical journal : MMJ 2022. link 3 Frost K, Schick A, Mount R. A retrospective analysis of the concordance of in-house fungal culture and a commercial quantitative PCR from 16 dermatology referral practices across the USA (2018-2019). Veterinary dermatology 2022. link 4 Niu W, Updyke KM, Maxim E, Flaten HK, Dunnick CA, Dellavalle RP. Chinese institutional payments for publishing dermatology journal articles. Dermatology online journal 2018. link 5 Grzybowski A, Pietrzak K. Robert Remak (1815-1865): discoverer of the fungal character of dermatophytoses. Clinics in dermatology 2013. link 6 Bernhardt J, Hye F, Thallinger S, Bauer P, Ginter G, Smolle J. Simulation of a mycological KOH preparation--e-learning as a practical dermatologic exercise in an undergraduate medical curriculum. Journal der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG 2009. link 7 Elston DM. Dermatophytosis in the military. Cutis 2001. link 8 Rippon JW. Forty four years of dermatophytes in a Chicago clinic (1944-1988). Mycopathologia 1992. link 9 Terreni AA, Gregg WB, Morris PR, DiSalvo AF. Epidermophyton floccosum infection in a dog from the United States. Sabouraudia 1985. link 10 Hay RJ, Campbell CK, Wingfield R, Clayton YM. A comparative study of dermatophytosis in coal miners and dermatological outpatients. British journal of industrial medicine 1983. link 11 Rockoff AS. Fungus cultures in a pediatric outpatient clinic. Pediatrics 1979. link 12 Grappel SF, Blank F, Bishop CT. Immunological studies on dermatophytes. 3. Further analyses of the reactivities of neutral polysaccharides with rabbit antisera to Microsporum quinckeanum, Trichophyton schoenleinii, Trichophyton rubrum, Trichophyton interdigitale, and Trichophyton granulosum. Journal of bacteriology 1968. link

Dermatophytosis