Thursday, 2 January 2014

Skin terms

MACULE : a flat , colored lesion of less than 2 cms in
diameter , not raised above the surface of the
surrounding skin. A freckle or ephelid is a prototype
pigmented macule .
PATCH : a large ( greater than 2 cms ) flat lesion with a
color different from the surrounding skin. This differs
from a macule only is size .
PAPULE : a small, solid lesion, less than 0.5 cms in
diameter , raised above the surrounding skin surface and
hence palpable . ( example : a closed comedone or
whitehead, in acne ).
NODULE : a larger ( 0.5 -5.0 cms ) , firm lesion raised
above the surface of surrounding skin . this differs from a
papule only in size . ( example : a dermal
nevomelanocytic nevus ).
TUMOR : a solid, raised growth greater than 5 cms in
diameter .
PLAQUE : a large ( greater than 1 cm ) , flat topped ,
raised lesion , edges may either be distinct ( example :
psoriasis ) or gradually blend with surrounding skin
( example : eczematous dermatitis ) .
VESICLE : a small, fluid-filled lesion , less than 0.5 cm in
diameter , raised above the plane of the surrounding
skin. Fluid is often visible , and the lesions are
translucent{example : vesicles in allergic contact
dermatitis caused by toxicodendron (poison ivy)}.
PUSTULE : a vesicle filled with leucocytes . note : the
presence of pustules does not necessarily signify the
existence of an infection .
BULLA : a fluid filled ,raised , often translucent lesion
greater than 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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