What kind of concealer are you using? Stick, liquid, compact? Stick and compact are the heavier kinds of concealer are more for blemishes, zits that kind of thing. Those ones work best when you start off with a little bit and work it layer by layer. More liquid-y concealers work best around the nose, or eyes for dark circles and those can be just dabbed on and patted until they blend in. Again, I would say, layers work best because you're concealing the blemish, not drawing attention to it!