In my strive for perfect skin (for graduation) I have been trying out Lush's Grease Lightning Tea Tree Spot Treatment
Two pumps of this would provide you with plenty of product to coat a full face of flaws. One pump is perfectly sufficient to deal with a problematic t-zone like mine. The product is a gel-like consistency and smells yummily of tea tree.
As for its affectivity, one blob of gel on a problem area and the redness dissipates almost immediately, leaving a minor blemish that heals over night.
Warning: be careful when pumping, you don't want to waste this product and it shoots out of the bottle very quickly.