Ink stain removal on wood can be tricky because your pen might have made an indentation in the wood's surface. If this is the case, you must proceed a little more carefully than you normally would to remove the ink. Ink on wood stains are hard because anything you put on the wood might damage the wood. If you leave a substance on the wood it might end up warping or damaging it in other ways.
Additionally, if the wood has not been finished, the ink might have penetrated deep into the wood. In this case, getting the ink stain out of wood mght be next to impossible. If the wood is finished, you will have a chance of removing the ink stain.
You might try dish washing detergent in hot water and dip a towel in it. Try to remove the wood ink stain with this substance.
