Question 1

What is the clear fluid inside a blister?

Accepted Answer

The clear liquid is serum, essentially blood plasma with the red cells and clotting factors filtered out. It cushions the damaged skin, floats it above the raw wound bed, and carries proteins, glucose, and immune elements that support healing.

Question 2

Should you pop a blister or leave it alone?

Accepted Answer

For most small blisters, leave them intact. The unbroken roof is a sterile natural cover that keeps bacteria out. Popping it exposes the wound to infection and removes the fluid that protects the healing skin. Only very large or painful blisters should be drained carefully with a clean needle, leaving the roof in place.

Question 3

What actually causes a blister to form?

Accepted Answer

Blisters are caused by shear, the sideways dragging force that occurs when skin layers slide against each other, not by pressure alone. This tears cells apart along a weak plane inside the epidermis, and the body fills the resulting cavity with fluid. Damp skin raises friction and makes blisters more likely.

skin

All essays in .

The Emergency Field Hospital on Your Heel

The Chemistry of Being Delicious