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Microbiology, 2021

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21.1 • Anatomy and Normal Microbiota of the Skin and Eyes 857<br />

characteristics. These rashes can be the result of inflammation reactions or direct responses to toxins<br />

produced by the microbes. Table 21.1 lists some of the medical terminology used to describe skin lesions and<br />

rashes based on their characteristics; Figure 21.4 and Figure 21.5 illustrate some of the various types of skin<br />

lesions. It is important to note that many different diseases can lead to skin conditions of very similar<br />

appearance; thus the terms used in the table are generally not exclusive to a particular type of infection or<br />

disease.<br />

Some Medical Terms Associated with Skin Lesions and Rashes<br />

Term<br />

Definition<br />

abscess<br />

bulla (pl.,<br />

bullae)<br />

carbuncle<br />

crust<br />

cyst<br />

folliculitis<br />

furuncle<br />

(boil)<br />

macules<br />

papules<br />

pseudocyst<br />

purulent<br />

pustules<br />

pyoderma<br />

suppurative<br />

ulcer<br />

vesicle<br />

wheal<br />

localized collection of pus<br />

fluid-filled blister no more than 5 mm in diameter<br />

deep, pus-filled abscess generally formed from multiple furuncles<br />

dried fluids from a lesion on the surface of the skin<br />

encapsulated sac filled with fluid, semi-solid matter, or gas, typically located just below the<br />

upper layers of skin<br />

a localized rash due to inflammation of hair follicles<br />

pus-filled abscess due to infection of a hair follicle<br />

smooth spots of discoloration on the skin<br />

small raised bumps on the skin<br />

lesion that resembles a cyst but with a less defined boundary<br />

pus-producing; suppurative<br />

fluid- or pus-filled bumps on the skin<br />

any suppurative (pus-producing) infection of the skin<br />

producing pus; purulent<br />

break in the skin; open sore<br />

small, fluid-filled lesion<br />

swollen, inflamed skin that itches or burns, such as from an insect bite<br />

Table 21.1

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