Hi
It looks as though the stain us caused by the dye from the bag rather than the product itself. The best way to tackle this is to first try a Jean and Dye Transfer Remover Kit - this contains a 2 part process which is safe to use and will not damage the finish. These are the first two steps that we always try on any dye transfer problem.
Step 1 is a foam cleaner that can be given dwell time so will gently lift any dye without any aggressive agitation etc.
Step 2 is a specifically formulated Alcohol based cleaner.
If this does not work it means that the dye has been very aggressive and has travelled too far into the finish on the leather to be removed without also damaging the finish.
The next stage would be to use solvents so the area would then need to be recoloured and refinished also.
Hope this helps
Judyb