ok so i have dark undereye circles do to my allergies and i do wear concelear and makeup, which covers it up fine and blends into my face but if i ever take a picture with a flash, it looks like i'm wearing a white mask around my eyes...why is that??? and how can i make it stop?

Avoid using green, white, or pink base concealers. Try using a yellow-based concealer, it corrects most dark circles.