Terminology Flashcards
Macule
a small flat lesion with a change in color but no elevation, depression, or change in texture. It has a discernable border with the normal skin surrounding it. Descriptors include the sharpness of borders (sharply vs poorly demarcated) and the character of the borders (eg, smooth, scalloped, geographic, angular, stellate, etc).
Patch
a flat lesion that is larger than a macule. Boundary between macule & patch is 5mm or 10mm.
Papule
a discrete firm lesion that is elevated above surrounding skin. Descriptors include flat-topped, dome-shaped, conical, acuminate, follicular, umbilicated, pedunculated, hyperkeratotic, lichenified (often in combination).
Plaque
is a papule with a diameter >5mm or 10mm. It can be a single large papule or a cluster of coalescing papules. Descriptors include those for papule plus linear, arcuate, annular, & more.
Nodule
discrete, palpable, usually round or oval lesion of the skin >1cm in diameter. Applies to processes involving any or all levels of the skin. Can be benign or malignant. Can involve any tissue of the skin. Nodules are often spherical and involve both depth & elevation. Can be soft (eb, lipoma), firm (keloid), or hard. Descriptors include lobulated, spherical, lens-shaped.
Tumor or mass
an even larger solid lesion that also can be either benign or malignant
Wheal
(also called hives or urticaria) a plaque caused by temporary edema in the upper dermis. Usually flat-topped and no epidermal change (eg scale or lichenification). Can vary in size & shape. Color is often light pink but may be bright red, even very pale, or red along margins and pale in the middle. This is not due to pigmentary change but to degree of dilation of blood vessels in the superficial dermis. Wheals blanch upon pressure. Descriptors include round, annular, arcuate, polycyclic, with round or arcuate configurations. Should be distinguished from angioedema, massive edema involving the entire dermis & subcutaneous tissues.
Vesicle
a small, circumscribed, usually elevated, fluid-filled lesion
Bulla(e)
a large vesicle >5mm (or 10mm). May attain diameters of several cms. Descriptors include tense vs flaccid/fragile; hemorrhagic.
Pustule
a circumscribed, elevated lesion containing purulent material. Some regard this as a secondary lesion, specifically a vesicle whose contents evolve from serum → pus.
Cyst
A palpable, compressible nodule with distinct borders. On palpation, it seems to be spherical with fluid or semi-solid contents.
Comedo
(plural = comedones): Dilated orifice to a hair follicle filled with a plug made of keratin & sebum. Closed comedones are whiteheads; open comedones are blackheads.
Cutaneous horn
discrete, hard or keratotic papule with an outward projection that is greater than the lesion’s diameter at its base. Generally cylindrical with same diam from base to end.
Telangiectasia
permanent dilation of superficial blood vessels, nonpalpable
Petechiae
Tiny purpuric macule, about 1mm (or smaller) in diameter,
Pupura
Non-blanching discoloration of skin due to blood vessel damage that permits blood to escape, either in large amounts or as small numbers of red blood cells. Color may range from bright red to reddish-purple to puplish-black (when surrounding tissue is necrotic) or rust-colored (when lesions are several days to weeks old). Often flat (macular or patch) but may be elevated if blood vessels are inflamed (palpable purpura is regarded as a sign of vasculitis). Does not apply to congenital vascular birthmarks.
Angioma or Hemangioma
Elevated lesion (papule or plaque) made of blood vessels. Can be congenital or acquired.
Ecchymosis
Large lesion of purpura, may be palpable
Telangiectasia
a dilated superficial blood vessel that blanches on pressure
Atrophy
thinning of the epidermis or dermis or both, that usually causes a depression in the skin. Epidermal atrophy usually causes a shiny, easily wrinkled surface to the skin. Dermal atrophy often produces a slight depression in the skin and allows one to see blood vessels
Burrow
an irregular, linear tunnel found in the uppermost part of epidermis. It is usually slightly raised and bordered by red, itchy skin. Caused by scabies
Erosion
a superficial denudation of the skin, usually implying focal loss of the epidermis. Usually oozing or moist. Does not lead to scarring
Excoriation
scratch mark that removes the epidermis, leaving a linear erosion. There is usually serous or bloody exudate
Crust
Crust
Eschar
Thick, usually black, crust over an ulcer or necrotic tissue.
Fissure
Linear or elongate, wedge-shaped (“canyon-shaped”) splits or cracks extending into dermis.
Pustule
discrete elevated vesicle or bulla of skin, usually small, containing purulent exudate composed of inflammatory leukocytes (pus), with or without cellular debris. May be superficial, deep-seated, follicular, grouped, etc, and may arise secondarily from a vesicle.
