I've used this method before, just remember to try it on an inconspicuous area first to make sure it doesn't discolor the leather and blot it on, don't scrub. I wouldn't worry about the "tear", it's not cut through the leather and will gradually wear into the surrounding area as the entire seat wears. Just think of it as a little character in your saddle
Isopropyl alcohol, plain old rubbing alcohol, works best for home removal of ink stains from leather. Fresh ink stains are easier to remove and usually come out easily, while older stains may require repeat treatments. Leather is porous and the stain can penetrate deep into the hide.
Begin by dampening a white cotton cloth or cotton swab with the alcohol. Don’t use a colored cloth because it can transfer dye to light colored leather. Work from the outside of the stain toward the middle by dabbing with the cloth. Keep the work area small – do not spread the ink into a bigger area!
You should be able to see the ink transfer to the cloth. Dampen a clean area of the cloth or get a new swab as you see ink coming off to prevent re-staining the garment. Gently, keep blotting away until the ink is gone. Do not scrub harshly as that can remove color and a layer of the leather.