Ink is tricky and will spread as soon as you put any solvent on the spot. If it is a small mark, try hairspray with a clean cloth. Spray some on, use the blunt end of a table knife and work the spot. Dab off with clean rag. Repeat as many times as needed. On some fabics this will leave a ring. A damp rag should eliminate any residue. Another solution it to take it to a reputable dry cleaner. They may have to send it out and it will cost at least $20 to have it cleaned. The last resort is to turn the cushion over and put the spot on the bottom.