Bubbles appear with a second degree burn, an intercellular substance is formed in it. If you pierce the bubble, the substance will leak out and an open wound will form, so you can infect an infection, and this is very dangerous. If, nevertheless, it is punctured, then only under sterile conditions, in the doctor's office! The important thing is that the bladder will deflate itself in a couple of days and everything will pass much faster in a natural way!
The vesicle that appears on the skin after burns contains serous fluid (lymph), sometimes blood. It appears as a result of exfoliation of the upper layer of the epidermis, and these fluids flow there. Under no circumstances should it be burst, it can lead to inflammation and infection.