Indian Journal of Dermatology
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Year : 2015  |  Volume : 60  |  Issue : 1  |  Page : 66-73

Is frictional lichenoid dermatitis a minor variant of atopic dermatitis or a photodermatosis

1 Department of Dermatology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India
2 Department of Dermatology Chacha Nehru Childrens Hospital, New Delhi, India
3 Department of Pathology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India

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Kabir Sardana
466, Sector 28, Noida, UP - 201 303
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0019-5154.147797

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Context: Frictional lichenoid dermatitis. Background: Frictional lichenoid dermatitis (FLE) is an entity that is probably under diagnosed and has been variably associated with either friction and/or atopy with a distinctive seasonal variation. Aims and Objectives : To study correlation of FLE with UV index and to assess its association with atopic dermatitis. Materials and Methods: A cross sectional analysis of children with FLE was done, over a period of 6 years in two tertiary hospitals. A detailed history and examination was done to assess the features of atopic dermatitis. The number of cases seen per month was compared with the mean monthly UV index. Two-tailed significance tests using Pearson's coefficient of correlation and T-test were used to interpret the data. (P < 0.05). Results: One hundred seventy-four patients were studied using the UKC criterion 17.2% of the patients had AD while xerosis (40.3%) was the predominant cutaneous finding. The number of patients seen in summer was more than in winter (P < 0.05) but there was no statistical difference between the cases in winter and spring. There was a significant correlation of the number of cases per month with UV index (P = 0.019). Almost 42% of patients gave a history of recurrence. Conclusions : FLE is probably not associated with atopic dermatitis and is likely to be related to the ambient UV index though a larger cohort with meticulous follow up may be needed to draw a final conclusion. Statistical Analysis Used: The Pearson's coefficient of correlation was used for comparing the cases per month with the UV index. The tests of hypothesis used included the paired T-tests. F-test of variance, Welch test, Wilcoxon rank sum test and the Kolmogorov-Smirnov Test. P < 0.05 was considered significant.

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