A blister is a pocket of fluid between the upper layers of skin. The most common causes of blisters are friction, freezing, burning, infection and chemical burns. In most of the cases, blisters heal on their own. The skin over the blister helps keep out infections. It is best to put a bandage on the blister to keep it clean.
However, when we ignore the fact that cutting a bulla open can be dangerous and unpleasant, this girl is determined to do such thing.
Her friend cut open the blister with a knife, and shortly after that, her hand was loaded with puss and blood.
It looks really gross when it starts oozing the liquid out. You can see the video below, but have in mind that the video contains graphic imagery that may be disturbing to some of you!