Webster's New World Medical Dictionary

error, alpha
See 
alpha error.
error, beta
See 
beta error.
error, type I
See 
alpha error.
error, type II
See 
beta error.
errors of metabolism, inborn
See 
metabolic
disease.
ERT
Estrogen replacement therapy.
eponym
146
06_189283 ch05.qxp 4/18/08 10:14 PM Page 146
http://www.rashidislamiccenter.com
http://www.allofislam.com/

---

erythema
Redness of the skin that results from
capillary congestion. Erythema can occur with
inflammation, as in sunburn and allergic reactions
to drugs.
erythema chronicum migrans
The classic ini-
tial rash of Lyme disease. In the early phase of ery-
thema chronicum migrans, within hours to weeks of
the tick bite, the local skin develops an expanding
ring of unraised redness. There may be an outer ring
of brighter redness and a central area of clearing.
See also 
Lyme disease.
erythema infectiosum
See 
fifth disease.
erythema nodosum
An inflammatory reaction
that occurs deep in the skin and is characterized by
the presence of tender, red, raised lumps or nod-
ules that range in size from 1 to 5 centimeters and
are most commonly located over the shins but occa-
sionally on the arms or other areas. The causes of
erythema nodosum include medications (such as
sulfa-related drugs, birth control pills, estrogens,
iodides, and bromides), strep throat, cat scratch
fever, fungal diseases, infectious mononucleosis,
sarcoidosis, Behcet’s syndrome, inflammatory
bowel disease (Crohn’s disease and ulcerative coli-
tis), and normal pregnancy. In many cases, no
cause can be determined. Erythema nodosum may
be self-limited. If treatment is needed, the underly-
ing condition is treated, and treatment is simultane-
ously directed toward the erythema nodosum itself.
Treatment can include anti-inflammatory drugs and
cortisone given by mouth or injection. Colchicine is
sometime used effectively to reduce inflammation.