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Background:  Although there have been many epidemiological studies, research focusing on psoriasis' health burden on a global scale is still lacking. Trends and variations in the global health burden of psoriasis are evaluated by time, age, gender, geographical location, and socioeconomic status, using disability-adjusted life years (DALYs) from the Global Burden of Disease Study.   Methods:  The health burden of psoriasis was evaluated by DALYs, which combined years lost to disability (a morbidity component) with years of life lost (a mortality component). The global and national DALYs number, crude DALYs rate, and age-standardized DALYs rate were obtained from the GBD 2017 study database. The corresponding human development index (HDI) was collected from the United Nations Development Programme.   Results:  From 1990 to 2017, the DALYs number and crude DALYs rate due to psoriasis increased by 73 and 22%, respectively. In comparison, the age-standardized DALYs rate showed a slight increase. Patients in the age range of 65–69 years bear a more significant psoriasis burden. Both males and females showed an increasing trend in burden caused by psoriasis over the past 27 years, with females bearing a more significant psoriasis burden than males. The health burden of psoriasis was substantially unequal in geography with a Gini coefficient of 0.27. The concentration indexes indicated a socioeconomic associated inequality in psoriasis burden with values of 0.22, accounting for 48.64% variance across countries (R2 = 0.4864,  p  < 0.001). Between-nation inequality in the distribution of psoriasis burden continued to decline throughout the past 27 years. Gini coefficients of psoriasis burden decreased from 0.280 in 1990 to 0.265 in 2017. The concentration indexes indicated the same trend with 0.236 in the 1990s and 0.223 in 2017.   Conclusions:  Global health progress in psoriasis together with inequality in the past few decades. Although the inequality of psoriasis burden has shown some improvement during the past 27 years, disparities still exist in age, gender, geographical location, as well as socioeconomic status. The findings of this study highlight the global importance of psoriasis and is important in policy planning for psoriasis services on a global scale.

Epidemiological Variations in the Global Burden of Psoriasis, an Analysis With Trends From 1990 to 2017