Usage History of 'psoriasis'

The following chart shows how frequently 'psoriasis' appeared in printed materials over time. For example, the word 'psoriasis' occurred 8 times in books in 1728 and 42,889 times in 2008. From 1728 to 2008, the word 'psoriasis' was used a total of 932,116 times in books scanned by Google. See Reference: Google Ngram project.

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