If my sour cream has a small amount of liquid and is a little bumpy at the top, has it gone bad? It's still white and within the exp. date!

for your information, the liquid on top is some of the whey separating from the solids. whey and solids are the makeup of cream & milk. you can mix it back into the sour cream, use it in a bread recipe, etc. purchased sour cream will not go bad until it molds. it lasts weeks after the exp date. however, when in doubt don't use. don't ever taste foods you think have spoiled. the consequences of even a small exposure to some pathogens, you don't want to EVER experience.

I always taste it when in doubt. If it isn't good, you'll know instantly.

Probably not. Just stir well and it should be fine. Be mndful of the expiry, too.

Nope, it's fine to use.