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A foundation is applied all over the face for a smooth, even finish. Concealer is used sparingly as a spot treatment, covering redness, dark spots, and blemishes.
While each formula is different, concealer is often much more concentrated, adding more intense coverage. Foundation is lighter and usually blurs rather than conceals.
Foundation is used in your exact shade match, blending seamlessly into your neck and chest. Concealer used for spot treatments should also match your skin tone.
Foundation can be applied with a brush or sponge all over the face. Concealer is applied sparingly with small concealer brush or sponge on blemishes, under-eye, and discoloration.
A dot of matte, high-coverage foundation over a blemish can help blur the imperfection. Still, this is not a long-term solution.
Because of their different formulations and intended uses, a foundation isn’t a good substitute for concealer. Lighter, dewier foundation formulas may even make a problem area look worse.