You might try getting some green concealer. It balances out the purple.
I would try the green tinted concealer and before it sets lightly use a bit of powder on it. Once set continue with the rest of your make up routine.
Check this site, you will learn on how to put and blend your makeup.
Here's more tutorial's that might help you.
Get a yellow concealer, blend with your finger, apply a brightening concealer, apply your foundation, and then lightly set your under eyes with loose translucent powder.