So one of our readers asked us this question the other day: How do blisters form and what is the purpose of the liquid inside the blister?


Blisters form when the top layer of skin gets detached from the lower layers, separating “plasma” sacs in the process. The plasma is completely sterile and serves to protect the lower layers of skin from further harm, basically nature’s band-aid with a bit of pain thrown in to keep you from doing more damage.

To pop a blister use a sterilized (wiped with alcohol or hydrogen-peroxide) sewing needle along the side of it, as low as you can go. Aim the needle into the fluid, it shouldn’t hurt. Press the plasma out, apply antibiotic ointment and a band-aid. Done.

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Last Update: July 23, 2016

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