How to apply concealer under the eyes - the foolproof guide to covering dark circles, blemishes, and more. Plus, the golden rule for blending concealer. We're back with the sixth episode in our makeup product series, where we've been delving into the key components in our makeup bags, chatting through which concealer is best for blemishes or dark undereyes, and, now, the best way to apply concealer. Our Beauty Editor, Fiona McKim, is talking us through the 4-step process of concealer application