Ink readily stains leather, and it is one of the most difficult stains to clean, according to HowStuffWorks. Cleaning products can easily damage the color and surface of suede or leather. It's best to take ink-stained articles to a professional leather cleaner.
In an emergency, particularly if the ink is fresh, using rubbing alcohol may remove the stain, according to About.com. First, test a small amount of rubbing alcohol in a hidden spot. Apply the rubbing alcohol to a clean white cloth or a paper towel. Dab at the stain, and work in small sections at a time, working from the outside in to avoid the appearance of an ink halo around the stain. Continue to blot the stain until all of the ink has transferred to the cloth or paper towel. Allow the item to air dry between treatments. Repeat if necessary.