A small circumscribed area differing in color or structure from the surrounding surface.
butterfly p. butterfly (2)
p. clamping a technique used in the study of ion channels in which the movement of ions across a small p. of isolated membrane is measured when the membrane is electrically polarized or hyperpolarized and maintained at that potential.patch clamp;
cotton-wool p.'s white, fuzzy areas on the surface of the retina (accumulations of cellular organelles) caused by damage (usually infarction) of the retinal fiber layer.cotton-wool spots;
herald p. the initial rapidly enlarging oval-shaped red papulosquamous lesion, usually on the trunk, heralding the widespread eruption of pityriasis rosea, and preceding the latter by 7-14 days.
Hutchinson's p. salmon p
moth p. chloasma
mucous p. an oval to round, yellow-gray to white, membrane-covered lesion or lesions occurring on the mucous membranes; usually seen in secondary syphilis.
opaline p. a mucous p. of silver-gray appearance.
Peyer's p.'s collections of many lymphoid follicles closely packed together, forming oblong elevations on the mucous membrane of the small intestine.folliculi lymphatici aggregati [NA], aggregate glands, aggregated lymphatic follicles, aggregated lymphatic nodules, agmen peyerianum, agminate glands, agminated glands, Peyer's glands;
salmon p. interstitial or parenchymatous keratitis giving rise to neovascularization of the cornea.Hutchinson's p;
shagreen p. shagreen skin
smoker's p.'s obsolete term for leukoplakia.
soldier's p.'s milk spots (1), under spot
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