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Dermatologic macroscopic terms (morphology)
MSK/Derm
15
Medical
Graduate
04/06/2013

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Term
Macule
Definition
flat lesion with well-circumscribed changed in skin color < 5mm
eg - freckle, labial muscle
Term
Patch
Definition
macule > 5mm
eg - lg birthmark (congenital nevus)
Term
Papule
Definition
elevated solid skin lesion < 5mm
eg - mole (nevus), acne
Term
Plaque
Definition
papule > 5mm
eg - psoriasis
Term
Vesicle
Definition
small fluid-containing blister < 5mm
eg - chickenpox (varicella), shingles (zoster)q
Term
Bulla
Definition
large fluid-containing blister > 5mm
eg - bullous pemphigoid
Term
Pustule
Definition
vesicle containing pus
eg - pustular psoriasis
Term
Wheal
Definition
transient smooth papule or or plaque
eg - hives (urticaria)
Term
Scale
Definition
flaking off of stratum corneum
eg - eczema, psoriasis, SCC
Term
Crust
Definition
dry exudate
eg - impetigo
Term
Hyperkeratosis
Definition
inc thickness of stratum corneum
eg - psoriasis
Term
Parakeratosis
Definition
hyperkeratosis with retention of nuclei in stratum corneun
eg - psoriasis
Term
Acantholysis
Definition
separation of epidermal cells
eg - pemphigus vulgaris
Term
Acanthosis
Definition
epidermal hyperplasia (inc spinosum)
eg - acanthosis nigricans
Term
Dermatitis
Definition
inflammation of skin
eg - atopic dermatitis
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