the solvent has removed the top colour sealant, and the colour itself.this can be easily rectified by a professional leather technician by removing the solvent soaked into the hide, matching the original colour and re sealing the hide.
do not attempt to re colour with felt pen, shoe polish or paint as you will worsen the issue, making the repair longer and possibly more expensive.
search for leather repair services, the repair can be done in yopur home without taking the item away.
furniture fixer., August 2009