You can use other, better tools later, but pens are always a great first tool. If you’re not encumbered by an uncomfortable grip, ink that skips, or a scratchy, draggy contact point, your ideas ...
Create a natural scrub by mixing olive oil with a pinch of sugar. Rub it over the ink-stained area in circular motions. The scrub will help lift the stain while keeping your skin moisturized.