Page 519 - First Aid for the USMLE Step 1 2020, Thirtieth edition [MedicalBooksVN.com]_Neat

Musculoskeletal, skin, and connective tissue ` dERmatology Musculoskeletal, skin, and connective tissue ` dERmatology section iii 475

Dermatologic macroscopic terms
lEsion ChaRaCtERistiCs EXamplEs
Macule Flat lesion with well-circumscribed change in Freckle (ephelide), labial macule A
skin color < 1 cm
Patch Macule > 1 cm Large birthmark (congenital nevus) B
Papule Elevated solid skin lesion < 1 cm Mole (nevus) C , acne
Plaque Papule > 1 cm Psoriasis D
Vesicle Small fluid-containing blister < 1 cm Chickenpox (varicella), shingles (zoster) E
Bulla Large fluid-containing blister > 1 cm Bullous pemphigoid F
Pustule Vesicle containing pus Pustular psoriasis G
Wheal Transient smooth papule or plaque Hives (urticaria) H
Scale Flaking off of stratum corneum Eczema, psoriasis, SCC I
Crust Dry exudate Impetigo J
A B C D E

F G H I J

Dermatologic microscopic terms
lEsion ChaRaCtERistiCs EXamplEs
Hyperkeratosis  thickness of stratum corneum Psoriasis, calluses
Parakeratosis Retention of nuclei in stratum corneum Psoriasis, actinic keratosis
Hypergranulosis  thickness of stratum granulosum Lichen planus
Spongiosis Epidermal accumulation of edematous fluid in Eczematous dermatitis
intercellular spaces
Acantholysis Separation of epidermal cells Pemphigus vulgaris
Acanthosis Epidermal hyperplasia ( spinosum) Acanthosis nigricans, psoriasis

FAS1_2019_11-Musculo.indd 475 11/7/19 5:24 PM