I had a perforation where my thumb was. It's a factory error/poor quality material, - but it's useless to look for it. The mouse is otherwise fully functional, so how did they fix the growing hole? I have tried various adhesive strips, but they all eventually peeled off after 14 days to a month. So I resorted to a more "brutal" solution. I used a hot glue gun (the kind you use on a melted plastic rod). Immediately after application, I carefully shaped and sealed, not too much, so that just a little bit of the hole was healed, a plug was formed, which is transparent to the touch, it does not hurt and the hole does not sag, I have had it like this for 4 months and it seems to work. Maybe a tip will help someone.