Anything that's near the surface will gradually come out as the skin cells die off, fall off, and are replaced from underneath. Anything below the skin will be encapsulated and just stay there.
Solvents for nitrocellulose (the straw color left after the graphite or other surface coating is burned off the grains) include acetone and ethyl ether and several others. They will make the nitrocellulose gel-like and it will then act a little like model airplane cement. They will also dissolve the oils from your skin, leaving it very dry and will sting badly if raw skin is underneath a particle. Letting it grow out may not be so bad.
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