Trimmers usually have two metal combs, with the outward one that touches our skin being stationary and the inner one moving rapidly left to right. The hair gets in between the teeth of those combs and get cut. Skin is too firm to push up in between those small gaps so it’s mostly safe. You can also tell even if you use trimmers at their lowest setting that they don’t completely get rid of hair like a razor does, they leave some behind.
It is possible to be cut from them, either by pushing the trimmers towards the skin at an angle instead of parallel to the skin, or when cutting near skin folds or loose skin, such as when cutting near and around the ears, nose, or as many unfortunate people have discovered, when trying to groom your private areas.
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