For concealers, I usually use synthetic brushes. Most of the time, I just use my ring finger to pat in the concealer under my eyes. Whenever I reach for brushes to blend out the under eye area though, I only reach for 2. One is the Real Techniques Domed Shadow Brush and the other is Zoeva 142 Concealer Buffer brush.
I think I bought the Real Techniques one about 2 years ago, and added Zoeva to the family just last year. Both are pretty similar in size, but while RT is pinched, Zoeva is round. In my opinion, both are just as soft and dense, and they do not feel scratchy even on such a delicate eye area. The RT brush is less stiff with more give, so it’s easier to blend out the concealer without dragging the skin around. That is why when I use the Zoeva concealer buffer brush, I have to make sure to use the least pressure possible to minimize dragging. The Zoeva brush is great for patting / stippling in concealers when I need more coverage though 🙂
The RT brush is of course great for applying cream eye shadows as well, but I just prefer using it for concealer. For the Zoeva concealer buffer brush, I also like to use it to blend out harsh edges on the eyes. It diffuses the hard lines effortlessly, but again, it must be done with a very light hand or the eye shadows might disappear.
Both these brushes are multi taskers which I think are great additions to my brush family. If I were to choose one though, I’d go for the Real Techniques brush. It is marginally softer, but I like that it has a little more give, but not too much. Both have their own advantages, so I’m keeping them. What do you use to apply under eye concealers? In the end, I think fingers work best, but it’s handy to have brushes as well 🙂