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Type 2A Koebner phenomenon in vitiligo is distinct from other subtypes: observations from an Indian cohort
Author(s) -
Kanwar A.J.,
Mahajan R.,
Parsad D.
Publication year - 2014
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/bjd.12651
Subject(s) - venereology , vitiligo , dermatology , medicine , cohort , family medicine , pathology
Summary Background Koebner phenomenon ( KP ) in vitiligo has been redefined and classified recently. Objectives To study the clinical characteristics of various grades of KP . Methods In this prospective cross‐sectional study, 202 patients with vitiligo were studied between January 2011 and December 2012 for the presence of KP . Based on the new Vitiligo European Task Force guidelines, KP was classified as type 1–3 and grades Ι–ΙV. Disease characteristics were studied in the various groups and subgroups based on the presence of KP . Results Koebner phenomenon was seen in 130 of 202 patients. The mean age of patients showing KP was 23·9 ± 13·6 years, compared with 19·3 ± 12·4 years for patients not showing KP ( P = 0·02). The mean body surface area involved in the KP ‐positive group was 4·6 ± 5·6%, vs. 1·5 ± 1·1% in the KP ‐negative group ( P = 0·001). Fifty‐five patients experiencing KP received low‐dose dexamethasone oral minipulse therapy compared with nine of those who did not ( P = 0·01). Of the 130 patients with KP , grade Ι KP was seen in 32, grade ΙΙ KP in 116, grade ΙΙΙ KP in 22 and grade ΙV KP in 16. There was a significant difference between type 1 and type 2A KP , and between type 2A and type 2B KP . In contrast, type 1 and type 2B KP were found not to be significantly different and had a good degree of correlation. Conclusions Patients with KP have a significantly higher age at onset, more extensive cutaneous involvement and are more likely to receive systemic steroids for disease control. Type 2A disease was found to be distinct from the other subtypes.