Webster's New World Medical Dictionary

bronchospasm
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bulla
See 
blister.
bullous
Characterized by blistering, such as a
second-degree burn.
bullous pemphiguoid
A disease characterized
by tense, blistering eruptions of the skin caused by
inflammation associated with antibodies in the base-
ment membrane layer of skin. It is diagnosed by
skin biopsy showing the abnormal antibodies
deposited in the skin layer. Treatment is with topical
cortisone creams but sometimes requires high
doses of cortisone (steroids) or other medicines
taken internally.
bump
A raised area resulting from blood and
serum leaking from injured blood vessels into the
tissues, as well as from the body’s inflammatory
response to the injury. A purplish, flat bruise that
occurs when blood leaks out into the top layers of
skin is referred to as an ecchymosis.
BUN
Blood urea nitrogen.
bunion
A localized, painful swelling at the base of
the big toe due to new bone formation. The affected
toe is often curved outward. Bunions are frequently
associated with inflammation of the nearby bursa
(bursitis) and degenerative joint disease
(osteoarthritis). Bunions most commonly affect
women, particularly those who wear tight-fitting
shoes and high heels. Treatment includes rest, a
change in shoes, foot supports, medications, or sur-
gery.
Burkitt lymphoma
A type of non-Hodgkin lym-
phoma that most often occurs in young people
between the ages of 12 and 30. Burkitt lymphoma
usually causes a rapidly growing tumor in the
abdomen and, less often, tumors in the testis,
sinuses, bone, lymph nodes, skin, bone marrow, or
central nervous system. Burkitt lymphoma is a
tumor of B cell origin. See also 
lymphoma, non-
Hodgkin’s.
burn
Damage to the skin or other body parts
caused by extreme heat, flame, contact with heated
objects, or chemicals. Burn depth is generally cate-
gorized as first, second, or third degree. The treat-
ment of burns depends on the depth, area, and
location of the burn, as well as additional factors,
such as material that may be burned onto or into the
skin. Treatment options range from simply applying
a cold pack to emergency treatment to skin grafts.