The adhesive is stronger than the leather finish. The damage is done when the sticker is pulled off. If chemicals are applied to the sticker to soften the glue prior to pulling it off, the damage can often be avoided. On most soft leather finishes, a little mineral spirits may be used to soften the glue. Several applications and gentle pulling can be used to dissolve the glue.
We see many of those 'Hi My Name is --------' stickers on jackets sent in for cleaning. It is better to have the sticker still on the jacket in most cases.
Brian Monk- Imperial Suede and Restoration, LLC