Lesions SDL Flashcards
what do linear lesions indicate
external trauma or lesions associated with a blood vessel, dermatome or a congenital malformation
What do annular lesions indicate
annular lesions usually indicate peipheral spreading of disease as a pyoderm or demophytosis
name the lesison
linear
name the lesion
annular
what do symmetrical lesions often indicate
systemically mediated disease
what is a macule
a circumscribed flat area of change in coloud of the skin less than 1 cm in diameter
what is a patch
same as a macule (change in skin colour) exceeding 1 cm in diameter
what is petechiae
pin point macules caused by hemorrhage of less than 1 cm in diameter
what is ecchymoses
pathces caused by hemorrhage of more than 1 cm in diameter
this is an example of what lesion
macules
what is a papule
small solid elevation of the skin less than 1 cm in diameter
what is a plaque
a large flatter elevation of the skin, sometimes formed by papules coalescing. a common example is the eosinophilic plaque seen in some cats with allergic skin disease
what is a nodule
a solid elevation of the skin greater than 1 cm in diameter that usually extends into the deeper skin layers
- can result from neoplasia, inflammatory cell accumulation or tissue dysplaysia/hyperplasia or mineral deposition
what is a tumour
a large mass involving skin structures. the term is often used in relation to neoplasia but can technically be used in inflammatory disease
what is a cyst
a cavity with an epithelial lining
what is a pustule
a small circumscribed elevation of the epidermis containing pus
what is a vesicle
a small circumscribed elevation of the epidermis containing clear fluid less than 1 cm
what is a bulla
a circumscribed elevation of the epidermis containing clear fluid more than 1 cm in diameter
what is a wheal
a circumscribed raised lesion consisting of dermal oedema
- usually reflect localised mast cell degranulation within the skin
what are scales
an accumulation of loose cornified fragments of the epidermis
what is a comedone
a dilated hair follicle devoid of hair and plugged with keratinous debris (a blackhead)
what is a follicular cast
an accumulation of keratinous debris around the hair shaft seen protruding from the follicular ostium or present when hairs are plucked and examined
what is a crust
a dried exudate on the skin sruface, either serum, blood, pus or a combo
what is an erosion
a break in the continuity of the epidermis that does not penetrate the basement membrane
what is an ulcer
a break in the continuity of the epidermis that penetrates the basement membrane
what is an epidermal collarette
a circular lesion with a circular rim of scale and or a peeling edge
what is a scar
an area of fibrous tissue replacing damaged skin
what is an excoriation
erosion or ulceration caused by scratching, biting or rubbing
what is a fissure
linear split through the epidermis into the underlying dermis
- often seen as a result of loss of skin elasticity
what is lichenification
an accentution of the skin markings giving an elephant skin like appearance
- associated with chronic inflammation and trauma
what is hyperpigmentation
skin pigmentation increased beyond what is normal for that area
what is hypopigmentation
skin pigmentation decreased beyond what is normal for that area
what is leukotrichia
loss of hair pigment
