if its just been sitting there, upright, with a crack on the side or bottom and theres a slow drip of oil, then i think its unlikely bacteria or whatever crawled up into the crack and in your bottle.
personally, i would probably keep using it.. but thats just me.. and ive injected plenty of dirt gear before, so my body isnt sensitive to a tiny bit of bacteria. (i was using one of my old batches of homebrew tren enanthate, felt smooth and painless to me.. gave a couple buddys some to try out, two of em got big red sore lumps every time theyd try to use it. these guys only buy the 150 dollar bottles of gear sold by a local ifbb pro... they arent use to dirty gear or infections. my other buddy has been in the game forever, he laughed about it and told me his body wasnt a pussy and hes been using mexican shit and everything else for decades... anyway, this was kind of off topic, but it was just to point out that what might be unsterile to you, may be just fine for someone else..
