How to clean light pen ink off of skin

I got some light pen ink from my fingers on my Shamisen skin, which is the Fibersen variant. I tried using an eraser, hot/cold water, and neither has worked. How can I remove the pen ink?

Kabukiman: I’m sorry to hear about you’re problem, so I will help in any way I can. Firstly I would try a little bit of rubbing alcohol on a soft piece of fabric (as to not damage the skin in any way.) If this does not work, then I do not have any other solution. The rubbing alcohol may spread the ink, so you don’t need to try this if you don’t want to. Good luck!