Bobbi brown corrector?

I want to get the Bobbi brown corrector for my undereye circles and blue-toned discoloration around my mouth.. It says on the website that it's designed to be layered underneath a yellow toned concealer. Is this necessary? Can I use it by itself? Thanks!

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Bobbi Brown corrector?

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http://sengpenting-mosting.blogspot.com/2010/12/bobbi-brown-corrector.html

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