A foreign body in the skin is most commonly a sliver of some material. Most of the time it is a wood splinter that goes in just very slightly under the skin.
If the sliver is a piece of pencil lead, remember that what is called "pencil lead" is not really lead. It is actually graphite, which is harmless. Even colored pencil leads are nontoxic.
Most very tiny slivers that are not deep in the skin do not need to be removed. They will come out with normal shedding of the skin.
Using a needle and tweezers
Remove large splinters, slivers, or thorns with a needle and tweezers.
Removing cactus spines
Usually cactus spines break when pressure is applied with tweezers. The following method can be used for removing cactus spines, as well as small fiberglass spicules or plant stickers (for example, stinging nettle): Apply a layer of hair remover wax. Let it air-dry for 5 minutes, or speed up the process with a hair dryer. Then peel off the gel or wax with the spicules. You can also try white glue, but it is less effective.
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