Dermatophytosis: a clinical study and efficacy of KOH examination as compared to culture


  • L. Venkat Narsimha Reddy Assistant Professor, Department of Dermatology, Venereology and Leprosy, Malla Reddy Institute of Medical Sciences, Suraram, Hyderabad, Telangana, India
  • Vani G. Assistant Professor, Department of Dermatology, Venereology and Leprosy, Malla Reddy Institute of Medical Sciences, Suraram, Hyderabad, Telangana, India



Dermatophytosis, Infection, Clinical types, KOH examination


Background: Dermatophytosis is very common condition. It is important to study their pattern and nature for proper diagnosis as well as management. The objective of the study was to study pattern of dermatophytosis and to study efficacy of KOH examination in comparison to culture.

Methods: A hospital based cross sectional study was carried out among 100 randomly selected patients with dermatophytosis for one year. Skin smears were examined with KOH. All such samples were also sent for culture examination. The results of KOH and culture were compared to see the efficacy of KOH.

Results: It was found that T. corporis was the most common clinical type of dermatophytosis in 48% of the cases. Most commonly affected age group was 21-30 years. Males were more commonly affected (55%) than females (45%). T. corporis was the most common infection in both the sexes followed by T. cruris, T. barbae and T. manuum are not seen among females while T. pedis was not seen among males. Maximum number of cases i.e. 72% was seen during summer season. The source of infection was not known in 81% of the cases. The sensitivity of the KOH was 95.5% and the specificity was 94.1%. The most common species responsible for dermatophytosis was T. rubrum in 38% of the cases.

Conclusions: The dermatophytosis was very commonly found in our settings. T. corporis was the most common clinical type. Majority of cases were seen during summer. KOH examination is useful for the diagnosis.


Weitzman I, Summerbell RC. The dermatophytes. Clin Microbiol Rev. 1995;8(2):240-59.

Poluri LV, Indugula JP, Kondapaneni SL. Clinico-mycological Study of Dermatophytosis in South India. J Lab Physicians. 2015;7(2):84–9.

Singh S, Beena PM. Comparative study of different microscopic techniques and culture media for the isolation of dermatophytes. Indian J Med Microbiol. 2003;21(1):21-4.

Monwar S, Hossain MA, Body F, Begum H, Begum N. Diagnosis of Dermatophytosis by Conventional Methods and Comparative analysis of Sabouraud Dextrose Agar and Dermatophyte Test Medium for Isolation of Dermatophytes. Mymensingh Med J. 2017;26(2):293-9.

Vyas A, Pathan N, Sharma R, Vyas L. A clinico-mycological study of cutaneous mycoses in Sawai Man Singh Hospital of Jaipur, North India. Ann Med Health Sci Res. 2013;3(4):593-7.

Paudel D, Manandhar S. Dermatophytic Infections among the Patients Attending Di Skin Hospital and Research Center at Maharajgunj Kathmandu. J Nepal Health Res Counc. 2015;13(31):226-32.

Bindu V, Pavithran K. Clinico-mycological study of dermatophytosis in Calicut. Indian J Dermatol Venereol Leprol. 2002;68(5):259-61.

Monwar S, Hossain MA, Mahmud MC, Paul SK, Nasreen SA, Joly SN et al. Pattern of Dermatophytes in Patients Attend in Mymensingh Medical College Hospital. Mymensingh Med J. 2015;24(4):684-90.

Venkatesan G, Singh R, Murugessan AG, Janaki C, Shankar GS. Trichophytonrubrum-the predominant etiological agent in human dermatophytoses in Chennai, India. Afr J Microbiol Res. 2007;1:9-1.

Valdigem GL, Pereira T, Macedo C, Duarte ML, Oliverira P, Ludovico P, et al. A twenty-year survey of dermatophytosis in Braga, Portugal. Int J Dermatol 2006;45(7):822-7.






Original Research Articles