title: Is frictional lichenoid dermatitis a minor variant of atopic dermatitis or a photodermatosis.
abstract: BACKGROUND
  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.
  
  
  OBJECTIVE
  To study correlation of FLE with UV index and to assess its association with atopic dermatitis.
  
  
  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.
  
  
  METHODS
  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.
authors: Department of Dermatology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
authors: Kabir
authors: K
authors: Sardana
authors: Department of Dermatology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
authors: Khushbu
authors: K
authors: Goel
authors: Department of Dermatology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
authors: Vijay Kumar
authors: VK
authors: Garg
authors: Department of Dermatology Chacha Nehru Childrens Hospital, New Delhi, India.
authors: Alka
authors: A
authors: Goel
authors: Department of Dermatology Chacha Nehru Childrens Hospital, New Delhi, India.
authors: Deepshikha
authors: D
authors: Khanna
authors: Department of Dermatology Chacha Nehru Childrens Hospital, New Delhi, India.
authors: Chander
authors: C
authors: Grover
authors: Department of Pathology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
authors: Nita
authors: N
authors: Khurana
keywords: Atopic dermatitis; Sutton's prurigo; UV Index; UV light; frictional lichenoid dermatitis; seasonal variation; summer
references: Pediatr Dermatol. 1987 Nov;4(3):205-8
references: 3422851
references: Acta Derm Venereol. 1978;58(6):547-9
references: 83084
references: Med Cutan Ibero Lat Am. 1975;3(3):193-8
references: 1241071
references: Br J Dermatol. 1996 Jul;135(1):12-7
references: 8776351
references: Br J Dermatol. 1994 Sep;131(3):383-96
references: 7918015
references: Can J Public Health. 2010 Jul-Aug;101(4):I5-9
references: 21033538
references: Arch Dermatol. 1966 Nov;94(5):592-3
references: 5960363
references: Arch Dermatol. 1974 Oct;110(4):639
references: 4414413
references: Pediatr Dermatol. 2009 Jan-Feb;26(1):6-13
references: 19250398
references: Pediatr Dermatol. 1990 Jun;7(2):111-5
references: 2359726
references: Arch Dermatol. 1994 Jan;130(1):106-7, 109-10
references: 8285727
references: Hautarzt. 1996 Feb;47(2):129-31
references: 8868457
references: Clin Exp Dermatol. 2009 Dec;34(8):e620-2
references: 19489852