Funny this just came up as I removed ink from a ballpoint pen just a couple of days ago! We have white leather La-Z-Boys and DH accidentally got ink on the arm. I did a search and found that rubbing alcohol was suggested to remove the ink. I used several cotton swabs--dipping in the alcohol and then squeezing them so they were not dripping wet. As soon as the blue ink started to show on the q-tips, I went to a new one. You don't want to smear the ink into a larger area. After I got the ink off, I blotted the area with a white paper towel. Then I finished off by wiping with a leather cleaner and conditioner. Looks perfect! Chairs are only a year old.
Hope this helps.
Judie