It is clothing dye and it will come off. You can try (with great patience) using Varsol on a terrycloth or old white towel rags.

Don't worry when it darkens from being wet. The warsol will dry and leave no trace of itself. It will require great patience and probably repeated efforts but it will come off.
Actually before you try the varsol, use a white eraser....

.....and rub it all over. Do this first, again, be patient.
Do the Varsol as a second measure.
If all fails, and ONLY if you are brave enough, you can soak it it a bath with some laundry soap.
Soak for an hour, then while under the water, use a cleaning brush or toothbrush. Be gentle with the brush.
when it comes off, you need to drain in a sink for an hour then hang to dry. Give it 3 days to dry, then treat it with suede protector.
NOTE
Before engaging in any of these measures, wait a day or 2 to see what others have to say.
The method(s) I have suggested are what I do here and if you decide to follow my advice, you do so at your own risk.
PS- Acetone will not work in this case and you won't need it anyway as it will ruin the dye finish on the suede.
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