Evaluation of ABO blood types in various dermatoses in Kashmiri population: A casecontrol study

Objective: to evaluate any association between various abo blood types and different dermatoses, viz, psoriasis, vitiligo, alopecia areata and pemphigus vulgaris. methods: this hospital-based, case-control study involved evaluation of abo blood typing of 140 cases of psoriasis, 76 vitiligo, 84 alopecia areata and 30 pemphigus vulgaris, and 2067 controls. results: o blood group was found in 37.1% patients of psoriasis, followed by blood type b (30%) and blood group a (25.7%), without any significant difference between cases and controls. in vitiligo patients, b blood group was found in 47.4% patients, followed by blood group o (36.8%) and blood group a (10.5%). the results between vitiligo patients and controls regarding blood group a and b were statistically significant. in alopecia areata patients, blood group b was found in 45.2% patients, followed by blood group o (28.6%) and blood group a (19%), the difference being not statistically significant. in pemphigus vulgaris patients, o and b blood group were found in 40% patients each, followed by blood group a (20%), but this was not statistically significant. conclusions: in psoriasis patients in our study, blood group o was the most common, but without any statistical significance than the controls. in vitiligo patients, b blood group was the most common and this was statistically significant. difference in the blood group a, although found less frequently than b and o blood group, was also statistically significant between study group and controls. in alopecia areata, b blood group was the most common, but this finding was not statistically significant when compared to controls. in pemphigus patients, blood group o and b were equally common, but this was not statistically significant than the controls.