You can try charging it - just watch it while its charging. If you see it start to swell while you're charging, stop charging immed and take it to a safe place. Prob wouldn't hurt to charge some where it can't do any damage to start with.

Some lipos will be fine after swelling a little. You need to see if yours will be ok or not. If it does start to swell again while charging, its time for a new lipo.