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How to get pen off your skin
Wet a cotton ball or washcloth with isopropyl alcohol (rubbing alcohol or surgical spirit) and scrub the ink off your skin.
Rubbing alcohol is often your best bet for removing the oil-based ink found in most pens. It dissolves oils, allowing you to wipe the ink off your skin.
Many other cleaning agents use alcohol as the main solvent, so using it straight should give you the best results. Try not to use the rubbing alcohol in a small, confined space, as the smell is very strong.