Groupon Coupon Code- $10 Off One Facial Deal! (5/12 & 5/13 ONLY) This post may contain affiliate links. Please see the full disclosure policy here. Posted on May 12, 2014 Written by Kristen Dann Leave a Comment For two days only Groupon is giving you $10 off one facial deal! Just enter promo code FACE10 at check out! There are a ton of deals to choose from between microdermabrasion, Facials, Peels, etc.