Week 6 intro to derm

example of primary vs secondary lesion

primary: plaque from eczema

secondary: scratching —> bleeding and erythema

Papule

superficial elevated solid lesion less than 1 cm in diam

small, circumscribed

Plaque

superficial flat topped lesion greater than 1 cm in diam

palpable lesion elevated above skin

nodule

deep solid lesion usually greater than 1 cm in diam

cyst

walled cavity containing keratin, mucin, or fluid

a nodule is under

epidermis

Macule

nonpalpable FLAT lesion less than 1 cm in diam

lesion w color change or texture change

patch

nonpalp lesion greater than 1 cm diam

FLAT, essentially larger macule

Vesicle

superficial fluid filled lesion less than 1 cm

elevated lesion, clear fluid

bullae

superficial fluid filled lesion greater than 1 cm

elevated, clear fluid

pustule

superficial localized accumulation of pus

less than 1 cm

elevated lesion

Crust

scab dried exudate of plasma/blood on surface of skin

scale

thickened stratum corneum

scar

visible alteration of skin following repair of injury

atrophy

loss of tissue (epidermal, dermal, subcutaneous)

lichenification

epidermal thickening characterized by thickening and accentuation of skin markings

Excoriation

oval or linear depressions in skin w/ complete removal of epidermis

Fissure

linear wedge shaped breaks in epidermis extending down to dermis

erosion

moist circumscribed depressed area limited to epidermis

Ulcer

defect devoid of epidermis extending into dermis of subcut tissue

Turgor

slowness to return to normal position when pinched

Most viral exanthems are caused by

enteroviruses

Viral exanthems