Primary Lesions

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Last updated 3:56 PM on 6/2/26
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27 Terms

1
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Macule

  • flat, non-palpable lesion

  • < 10mm in diameter

  • Well circumscribed change in skin color

<ul><li><p>flat, non-palpable lesion</p></li><li><p>&lt; 10mm in diameter</p></li><li><p>Well circumscribed change in skin color</p></li></ul><p></p>
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Papule

  • Solid

  • palpable lesion

  • <10mm

  • elevated above skin

  • firm, circumscribed(well defined)

<ul><li><p>Solid</p></li><li><p>palpable lesion</p></li><li><p>&lt;10mm</p></li><li><p>elevated above skin</p></li><li><p>firm, circumscribed(well defined)</p></li></ul><p></p>
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Plaque

  • Plateau- flat top

  • >10mm in diameter

  • elevated above skin

  • Well-defined

  • firm and rough

<ul><li><p>Plateau- flat top </p></li><li><p>&gt;10mm in diameter</p></li><li><p>elevated above skin</p></li><li><p>Well-defined</p></li><li><p>firm and rough</p></li></ul><p></p>
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Nodule

  • solid

  • palpable

  • 1-2cm

  • Elevated, circumscribed

  • deeper than papule

<ul><li><p>solid</p></li><li><p>palpable</p></li><li><p>1-2cm</p></li><li><p>Elevated, circumscribed </p></li><li><p>deeper than papule</p></li></ul><p></p>
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Nodule

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Plaque

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Papule

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Macule

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Telangiectasia

  • Results from secondary skin lesion

  • Dilated, superficial blood vessels

<ul><li><p>Results from secondary skin lesion</p></li><li><p>Dilated, superficial blood vessels</p></li></ul><p></p>
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Purpura

  • red-purple lesions that do not blanch

  • cause: blood forced from the vessel into surrounding tissue

<ul><li><p>red-purple lesions that do not blanch</p></li><li><p>cause: blood forced from the vessel into surrounding tissue</p></li></ul><p></p>
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Purpura

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Pustule

  • elevated, circumscribed

  • superficial cavity that contains purulent

  • Any size or shape

<ul><li><p>elevated, circumscribed</p></li><li><p>superficial cavity that contains purulent</p></li><li><p>Any size or shape</p></li></ul><p></p>
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Pustule

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Vesicle

  • circumscribed, elevated lesion with serous fluid

  • superficial

  • <5mm in diameter

<ul><li><p>circumscribed, elevated lesion with <strong>serous fluid</strong></p></li><li><p>superficial</p></li><li><p>&lt;5mm in diameter</p></li></ul><p></p>
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Vesicle

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Wheal

  • Transient- short term

  • elevated lesion caused by local edema

  • irregular shaped, variable diameter

  • solid

<ul><li><p>Transient- short term</p></li><li><p>elevated lesion caused by local edema</p></li><li><p>irregular shaped, variable diameter</p></li><li><p>solid</p></li></ul><p></p>
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Wheal

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Scale

  • heaped up corneal epithelium

  • dry, cracked appearance

  • flaky

<ul><li><p>heaped up corneal epithelium</p></li><li><p>dry, cracked appearance</p></li><li><p>flaky</p></li></ul><p></p>
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Scale

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Atrophy + causes

  • reduction is epidermal+dermal thickness, regression of sebaceous glands, subq fat loss, muscle layer atrophy

  • causes: high potency steroids, aging

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Bulla

  • circumscribed

  • elevated

  • contains serous fluid

  • >5mm diameter

  • ex) blister

<ul><li><p>circumscribed</p></li><li><p>elevated</p></li><li><p>contains serous fluid</p></li><li><p>&gt;5mm diameter</p></li><li><p>ex) blister</p></li></ul><p></p>
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Bulla

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