Chapter 8 - Skin Disorders Flashcards
cutaneous vasodilation
increases blood flow to the skin severalfold, substantially increasing convective transfer of heat from the core to the periphery
convective
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat
vasodilation
the dilatation of blood vessels, which decreases blood pressure
vitiligo
small areas of hypopigmentation that may gradually spread to involve larger areas
melasma
Also called: chloasma; a skin condition characterized by brown or blue-gray patches or freckle-like spots
macule
a patch of skin that is altered in color but usually not elevated
nodule
a small mass of rounded or irregular shape
papule
a small solid usually conical elevation of the skin, often filled with pus
pustule
a small circumscribed elevation of the skin containing pus and having an inflamed base
circumscribe (verb)
(1) to constrict the range or activity of definitely and clearly
(2) to draw a line around, to surround
(3) to construct or be constructed around (a geometrical figure) so as to touch as many points as possible (e.g. a circle circumscribing a square)
plaque
(1) an ornament, decoration, or commemorative tablet
(2) a localized, slightly elevated, abnormal patch on a body part or surface
(3) a sticky usually colorless film on teeth that is formed by and harbors bacteria
(4) a lesion in the cardiovascular system or the brain
(5) a clear area in a bacterial culture produced by viral destruction of cells
lesion
a region in an organ or tissue which has suffered damage through injury or disease, such as a wound, ulcer, abscess, or tumor
fissure
a crack in skin tissue
lichenification
the process by which skin becomes hardened and leathery or lichenoid (like lichen) usually as a result of chronic irritation
lichen
(1) any of several skin diseases characterized by the eruption of flat papules
(2) any of numerous complex plantlike organisms made up of an alga (alga is singular for algae) and a fungus growing in symbiotic association on a solid surface (as a rock)
symbiotic
(1) involving interaction between two different organisms living in close physical association
(2) denoting a mutually beneficial relationship between different people or groups
electrodesiccation
a fast and simple office-based procedure that uses electric current delivered via a needle-shaped electrode to superheat the skin in pinpoint precise areas
cryosurgery
the use of extreme cold in surgery to destroy abnormal or diseased tissue
urticaria
also called hives; reddened, itchy welts that may be triggered by exposure to certain foods, medications or other substances
welt (skin)
a red, swollen mark left on flesh by a blow or pressure
eczema
a condition that makes your skin red and itchy; it’s common in children but can occur at any age.
atopy (adjective: atopic)
the tendency to produce an exaggerated immune response to otherwise harmless substances in the environment; it can sometimes be genetic
immunoglobin
any of a class of proteins present in the serum and cells of the immune system, which function as antibodies
excoriation
(1) the act of abrading or wearing off the skin
2) a raw irritated lesion (as of the skin or a mucosal surface
abrasion
A type of open wound that’s caused by the skin rubbing against a rough surface. It may be called a scrape or a graze. When an abrasion is caused by the skin sliding across hard ground, it may be called road rash. Abrasions are very common injuries. They can range from mild to severe.
psoriasis
a skin disease that causes red, itchy scaly patches, most commonly on the knees, elbows, trunk and scalp
pemphigus
a rare group of autoimmune diseases. It causes blisters on the skin and mucous membranes throughout the body. It can affect the mouth, nose, throat, eyes, and genitals.
autoimmune disease
a condition in which your immune system mistakenly attacks your body
pemphigus vulgaris
the most common form of pemphigus; the epidermis separates above the basal layer. Blisters form initially in the oral mucosa or scalp and then spread over the face and trunk during the ensuing months. The vesicles become large and tend to rupture, leaving large denuded areas of skin covered with crusts
vesicle
also called a blister; a small fluid-filled bladder, sac, cyst, or vacuole within the body
vacuole
(1) a small cavity or space in tissue, especially in nervous tissue as the result of disease
(2) a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid