Introduction to Veterinary Dermatology and Diagnostic Methods Flashcards
Define alopecia
Hair loss
Define bulla
Localised collection of fluid >0.5 in diameter and larger than a vesicle
Define erythema
A diffuse or localised redness of the skin which disappears with diascopy
Define macule
A flat circumscribed skin discolouration <1cm in diameter without surface elevation or depression.
Define nodule
Circumscribed solid elevation greater than 1cm usually extending into the dermis, large nodules may be referred to as masses.
Define papule
A small solid elevation of the skin up to 1cm in diameter, feels solid and is due to the infiltration of inflammatory cells, fluid or foreign material, with oedema and epidermal hyperplasia
Define patch
A localised flat change in skin pigmentation larger than 1cm in diameter (big macule)
Define plaque
A flat topped elevation of the skin >0.5cm formed by a coalition of papulae; flatter than a nodule
Define pustule
Small circumscribed elevation of the epidermis filled with a clear fluid <0.5cm in diameter
Define wheal
A sharply circumscribed raised lesion consisting of oedema, usually appears and disappears within minutes to hours.
Define comedone
Dilated hair follicle with cornfified cells and sebaceous material
Define crust
Dried exudate, cells, pus and scale adherent to the surface
Define epidermal collarette
A circualr lesion with a marginal rim of scale
Define excoritation/erosion
Superficial damage to the epidermis
Define fissure
Linear cleavage into the epidermis
