There are lots of cosmetic products that are magical to hide or to enhance the different part of our face and the one of the best one is Concealer which not only very good hiding spots of redness, dark under eye circles, pigmentation spots and all sort of ugly looking marks, but it is very good to give you a smoother and younger looking skin.
You just need to know the right way of apply the concealer and the right kind to buy according to your skin tone and complexion and the right form of the product too, as there are so many forms of concealer including creamy or hard consistency, with brush or regular applicator, in a tube or jar or stick and they all are very good and effective.
Tricks to Apply The Concealer
Covering Under Eye Circles
If you are using it to hide the dark circles of your eyes then you should pick the shade a bit darker than your own skin tone to hide the under eye circles and better camouflage like if you have purple shade of your circles the pick a yellow toned concealer and for blue circles, use orange tone concealer and it would look the best and will provide the best coverage and now you need to use a sponge that has edgy corners to get the smoother excess to the thinnest corner of your face, your inner eye corner.
Now you just need to apply lots of petroleum jelly or Vaseline under your eyes and then you just need to wait a bit and then remove it and apply the thinnest layer of concealer and blend it with your foundation till you see no lines between these two shades.
Now if you are using the concealer to hide the scares then you need to follow the same drill that we followed to pick the right shade and then apply the foundation all over your face and then just before blending, apply the concealer on the spots, but not too much or not too small and then blend it with your foundation and blending is the trick of the best looking skin and appearance.
Best of luck.