What concealer does well
Concealer is brilliant at visually correcting darkness and creating a more even appearance. But makeup does not replace skincare.
Where hydration comes in
If the skin beneath your eyes is extremely dry, adding more concealer can sometimes make texture more visible.
A hydrating eye mask before makeup can help create a softer, smoother-looking canvas. Then concealer can do what it does best.
Skincare before makeup
It is not really eye mask vs concealer. It is skincare before makeup.
Care for the skin first. Then enhance whatever you want to enhance. Let your eyes blossom.