A or '''bulla''' is a defense mechanism of the human
Body . It consists of a pool of
Lymph and other
Bodily Fluids beneath the upper layers of the
Skin . It may be formed in response to
Burns or
Friction , and helps to repair damage to the skin. If a blister is punctured, it forms an
Open Wound and must be
Bandage d.
If a blister is associated with sub-dermal
Bleeding , it may partially fill with
Blood , forming an unpleasant ''
Blood Blister ''.
Blistering is a distinguishing characteristic of second degree
Burns .
Certain
Autoimmune diseases feature extensive blistering. These include
Pemphigus and
Pemphigoid . Blistering also occurs as part of
Foodborne Illness with
Vibrio Vulnificus (
Seafood ).
The class of
Chemical Weapons known as
Vesicant s acts by causing blisters (often within the respiratory tract).
Mustard Gas and
Lewisite are examples of such agents.
