Wk 16 Dermatology Flashcards
small cutaneous blister
vesicle
Primary lesion
macules, patches, papules, plaques, vesicles, bullas, nodules, tumors, pustules, comedo, wheal, cyst most characteristic, representative or native appearance of skin lesion
What is the single, most determining melanoma characteristic
thickness
What is the single, most melanoma prognostic factor
thickness
Macules and patches
both flat
-macule < 1 cm
patch > 1 cm
papules and plaques
both raised
papule< 1 cm
plaque > 1 cm
Vesicle and bullas
Both fluid filled
vesicle <1 cm
Bulla > 1 cm
Nodule and tumor
nodule - usually dermal or subq, greatest mass tends to be under surface
tumor - general refers to neoplasms. Tends to be rounded
Pustule and comedo
Pustule - filled w/ purulent fluid
comedo - lesion of acne, pilosebasceous unit filled w/ keratin (open vs closed)
Wheal
pink, edematous papules and plaques, often annular
cyst
closed sac
Secondary lesion/change
effects of exogenous factors or temporal changes that evolve during the course of a skin disease
Scale vs crust
secondary
scale - Accumulation of stratum corneum due to increased proliferation and/or delayed desquamation
crust - Serum, blood or purulent material
excoriation vs fissure
Secondary
excoriation = Exogenous injury to epidermis
fissure = linear cleft
Erosion vs ulcer
secondary features
erosion - partial loss of epidermis
ulcer - Full thickness loss of the epidermis. May have loss of the dermis or subcutis
Petechiae vs purpura
secondary features
petechiae - Non-blanchable macules small, < 2 mm
purpura - Non-blanchable macules, patches, papules, plaques
What is diascopy
Empty blood from the superficial vessels to determine if redness is from blood within vessels (erythema) or extravasated into the skin (petechiae, purpura)
Atrophy vs Lichenification
Secondary features
atrophy - Depression of skin from thinning of epidermis, dermis or fat
Lichenification - Thickening of the epidermis and accentuation of natural skin lines
Distribution vs configuration
distribution - where on body are the lesions?
configuration - how are the lesions arranged?
Terms for configuration
annular - ring shaped
nummular - coin shaped
polycyclic - coalescing circles, rings, incomplete rings
serpiginous - snakelike or serpentine
geometric
Terms for distribution
Scattered, widespread
acral- distal extremities
intertriginous - skin creases & folds
dermatomal
linear
grouped
targetoid - bull’s eye
photodistributed
symmetric
