Week 3 Flashcards
what is a rash?
an inflammatory skin eruption
differential diagnosis of a rash is primarily based on what?
morphology of the lesion
what are the steps to differential diagnosing a rash
- identify the primary lesion
- determine the global reaction pattern
- distribution of the lesions
what is a primary lesion?
initial lesion that has not been altered by trauma or manipulation, and has not regressed
what is a secondary lesion?
develops as the disease evolves or as the patient damages the lesion
type of primary lesion that is a circumscribed, elevated lesion that measures >1 cm and contains serous or hemorrhagic fluid?
bulla
type of primary lesion that is a circumscribed, nonpalpable discoloration of the skin that measures <1 cm in diameter
macule
type of primary lesion that is palpable, solid, round ellipsoidal lesion measuring > 1 cm; it differes from a plaque in that it is more substantive in its vertical dimension compared with its breadth
nodule
type of primary lesion that is an elevated, solid lesion that measures < 1 cm
papule
type of primary lesion that is a circumscribed, nonpalpable discoloration of the skin that measures > 1 cm
patch
type of primary lesion that is nonblanchin reddish macules representing extravascular deposits of blood, measuring < 0.3 cm
petechiae
type of primary lesion that is palpable, solid lesion that measures >1 cm
plaque
type of primary lesion that is nonblanching reddish macules or papules representing extravascular deposits of blood, measure > 0.3 cm
purpura
type of primary lesion that is a lesion that contains pus, may be follicular or non follicular
pustule
type of primary lesion that is circumscribed, elevated lesion that measures < 1 cm and contains serous or hemorrhagic fluid
vesicle
type of primary lesion that is a round or annular, edematous papule or plaque that is characteristically evanescent, disappearing within hours; may be surrounded by a flare or erythema
wheal
type of secondary lesion that is a depression in the skin resulting from thinning of the epidermis, dermis and/or subcutaneous fat
atrophy
type of secondary lesion that is a collection of dried blood, serum, and/or cellular debris
crust
type of secondary lesion that is a focal loss of epidermis does not penetrate below the dermal-epidermal junction and, therefore, can heal without scarring
erosion
type of secondary lesion that is thickening of the epidermis resulting from repeated rubbing, appearing as accentuation of the skin markings
lichenification
type of secondary lesion that is excess dead epidermal cells, silvery, greasy, desquamative or adherent
scale
type of secondary lesion that is abnormal formation of connective tissue
scar
type of secondary lesion that is a focal loss of full-thickness epidermis and partial to full-thickness dermis, which often heals with scarring
ulcer
what are the types of global reaction pattern
- papulosquamous eruptions
- folliculopapular eruptions
- dermal reaction patterns
- purpura and petechiae
- nonpalpable purpura
- blistering disorders
