Friday, April 8, 2011

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Dermatology - common terms

Macule:
A flat, colored lesion, <2 cm in diameter, not raised above the surface of the surrounding skin.
Patch:
A large (>2 cm) flat lesion with a color different from the surrounding skin. This differs from a macule only in size.

Papule: 
A small, solid lesion, <0.5 cm in diameter, raised above the surface of the surrounding skin and hence palpable
Nodule:
A larger (0.5–5.0 cm), firm lesion raised above the surface of the surrounding skin. This differs from a papule only in size
Tumor:
A solid, raised growth >5 cm in diameter.
Plaque:
A large (>1 cm), flat-topped, raised lesion; edges may either be distinct (e.g., in psoriasis) or gradually blend with surrounding skin (e.g., in eczematous dermatitis).
Vesicle: 
A small, fluid-filled lesion, <0.5 cm in diameter, raised above the plane of surrounding skin. Fluid is often visible, and the lesions are translucent
Pustule: 
A vesicle filled with leukocytes. The presence of pustules does not necessarily signify the existence of an infection.
Bulla:
A fluid-filled, raised, often translucent lesion >0.5 cm in diameter.
Wheal:
A raised, erythematous, edematous papule or plaque, usually representing short-lived vasodilatation and vasopermeability.
Telangiectasia:
A dilated, superficial blood vessel.

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