Should concealer be lighter or darker than foundation?

Depends entirely on the area. Under the eyes, half a shade to one shade lighter neutralizes shadow; on blemish marks, match the foundation or go half a shade deeper so the mark disappears into the base; for deliberate brightening, two shades lighter on planes meant to catch light. One depth across the whole face is where it fails.

What undertone covers dark circles?

Peach, because peach and orange sit opposite blue on the color wheel and cancel the blue-purple that shows through thin under-eye skin. Deeper skin tones usually need a more orange corrector to do the neutralizing. Yellow-leaning concealer on top can brighten, but the peach layer is what actually kills the darkness.

Do I need a color corrector and a concealer?

Not always. Mild darkness often disappears with a peach-leaning concealer alone. Correctors earn their keep when discoloration is strong — deep circles, red blemishes, dark marks — because a concealer trying to cover and neutralize at once has to go opaque, and opacity reads as texture. Two thin layers beat one heavy one.

Concealer shades follow logic that foundation does not

Concealer bought the way foundation is bought, matched to your skin with one shade and done, will fail somewhere on your face. Under-eye skin, blemish marks, and the planes meant to catch light need different depths and different undertones. The working principle, borrowed from working makeup artists: one area, one shade, one job.

Dark circles: lighter, and leaning peach

Under-eye circles read dark for two stacked reasons: shadow in a hollow, and often a blue-purple discoloration showing through thin skin. Correcting both means going half a shade to one shade lighter than your foundation and shifting the undertone toward peach — peach and orange sit opposite blue on the color wheel and visually neutralize it rather than stacking gray on top of it.

The lighter depth matters less than people assume; the undertone matters more. Going two shades lighter under the eye produces the pale crescent the internet calls the reverse panda. The correction should disappear into the face, not announce itself. On deeper skin tones, a more orange-leaning corrector does the neutralizing before the concealer goes on top.

Blemish marks: matched, and leaning yellow

Post-blemish marks are the opposite problem: discoloration that needs covering at the same plane as the surrounding skin, not brightening. The shade that works is the same depth as your foundation — see our guide to foundation finishes for how the base itself changes the read — or half a shade deeper, since marks usually sit slightly darker than healthy skin and an exact match can still look faintly gray over them.

Undertone here is yellow-leaning. Yellow counters the violet and brown tones typical of healing blemishes on light-to-medium skin, and it disappears into most foundations more quietly than pink does. This is also the one area where full coverage is the actual goal; brightening a pimple is the fastest way to spotlight one.

One area, one shade

The color wheel does the rest of the work. Green cancels red, which is why green correctors exist for active blemishes; peach and orange cancel blue-purple; yellow lifts violet and brown. A corrector cancels and a matched concealer blends — two products doing two jobs, which is why one pencil dragged across every zone of the face reads wrong everywhere. Our undertone guide covers how to place yourself before you shop the rest of makeup.

The brightening exception is deliberate, not a default: two shades lighter than foundation belongs on planes meant to catch light — the center of the under-eye over the peach layer, the bridge of the nose, the chin crease. Spread anywhere else, it stops looking like skin.

The system sounds complicated and takes about the same effort as one all-purpose concealer applied badly. Matched to the job, two or three shades outperform any single bottle you own.