Webster's New World Medical Dictionary

yeast rash
A slightly raised pink-to-red rash that
is caused by proliferation of yeast, usually in a moist
area such as the groin. Yeast rash is most common
in infants, but it can also occur on the skin of older
children and adults. Treatment involves keeping the
affected area clean and dry and applying topical
antifungal medication. Also known as diaper der-
matitis and nappy rash.
Yy
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yeast vaginitis
Infection of the vagina by Candida
albicans, which characteristically causes itching,
burning, soreness, pain during intercourse and uri-
nation, and vaginal discharge. Yeast vaginitis occurs
when new yeast are introduced into the vagina or
when the quantity of yeast in the vagina increases
relative to the quantity of bacteria. Yeast vaginitis
can be exacerbated by injury to the vagina, as from
chemotherapy; immune deficiency, as from AIDS or
cortisone-type medications; pregnancy or taking
birth control pills; antibiotic use; or diabetes.
Treatment involves use of topical or oral antifungal
medications. See also 
Candida albicans; yeast;
yeast infection; yeast vulvitis.
yeast vulvitis
A yeast infection of the vulva. Yeast
vulvitis commonly occurs with yeast vaginitis.
Common symptoms include itching, burning, sore-
ness, pain during intercourse and urination, and
vaginal discharge. Treatment involves use of topical
or oral antifungal medications. See also 
Candida
albicans; yeast; yeast infection; yeast vaginitis.
yellow fever
An acute, systemic viral illness
transmitted to humans through the bite of infected
mosquitos that may cause a flu-like illness or a
more severe illness with high fever, bleeding into the
skin, and death of cells (necrosis) in the kidney and
liver. The liver damage (hepatitis) causes yellowing
of the skin from severe jaundice. Yellow fever
occurs in sub-Saharan Africa and tropical South
America. Diagnosis is made via observation and, if
necessary, culturing or examining blood samples.
Yellow fever usually passes within a few weeks.
Nonaspirin pain relievers, rest, and rehydration with
fluids decrease discomfort. Yellow fever disease can
be prevented with a vaccination. See also 
yellow
fever vaccination.