A. The term hypoallergenic means less likely to cause an allergic reaction.
Cosmetic manufacturers making the hypoallergenic products use ingredients that most people don't react to.
There is always the chance that somebody is going to be allergic to an ingredient no matter how benign it seems.
Stop using the product asap. Read the ingredient list. It's a good idea to write the ingredients down in a journal or put them in the notes on your phone. That way if you react to another product, you can try to narrow done the ingredient and avoid it in the future.