I would probably call the vet and explain what's been going on. Then the vet can make that determination about bringing your glider back in or not. Personally, if it were me, I would probably return since his paw looks more swollen and is full of puss. It could be one of those situations where it gets worse before it gets better. But I'm a firm believer of 'better safe than sorry'.
Wishing you all the best!