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If you're trying to cover up acne scars, burns, or other marks on your face, the right makeup can do the trick. With oily skin, the key is sticking to powder-based cosmetic products. They produce the same results, but absorb some of the oil on your face rather than creating even more of it, as cream and liquid versions do.
Concealer is the first -- or only, depending on the size and severity of the marks -- product to apply when you're trying to cover up facial imperfections. A tapered concealer brush is the tool of choice in this scenario; coat it with the product and apply it onto your face with a sort of stippling motion. Dabbing the product onto the marks on your face provides better coverage than if you were to smear or blend it over top, providing too light of a coat and likely leaving the marks still showing through.
For your oily skin, stick with a light, oil-free foundation so you don't end up with more oil on your face, which is the last thing you need. Foundation can be applied on its own, or after concealer. Blend the foundation over your face and neck, dabbing lightly instead of rubbing when you go over the marks. This ensures thicker coverage over those areas, helping to cover them up.
A little bit of translucent powder goes a long way, helping to set your makeup so it lasts longer. That means less need for touch-ups through the day to reapply makeup over the marks on your face. It's especially good for you, because it creates a light powder coating over the makeup you've applied and prevents any excess oil on your skin from showing through and becoming a problem.
A bit of bronzer does more than just make you look like you've got a gorgeous, sunkissed glow about you. It can also work some wonders when you're trying to cover up imperfections on your face. Sweep the bronzer on over your skin -- it's best to use less and have to layer it than add too much at once and try scrubbing it off -- to use as shading, sort of drawing the attention away from where you don't want it. For instance, focus the bronzer under your cheekbones to create angles and attention there if you have marks on your forehead, or over your temples to divert focus from marks around the bottom of your face.