Veterinary Dermatology - Cat & Dog

RDVC ISS Cat & Dog - Dermatology

40 cards   |   Total Attempts: 182
  

Related Topics

Cards In This Set

Front Back
Types of primary skin lesions
Macule, wheal, vesicle, papule, pustule, nodule, tumor
What is a macule? What is a patch?
Macule: circumscribed flat lesion, with change in color of the skin or mucous membrane. Color change is due to:
1) melanin pigmentation
2) depigmentation
3) erythema
4) extravasation of blood (pupura)
Patch: a macule over 1cm in diameter
What is a wheal?
Sharply circumscribed, raised lesion consisting of edema. Often white or pink ridges.
What is a vesicle? What is a bulla?
Vesicle: A sharply circumscribed elevation of the skin up to 1cm in diameter, filled witj clear, free fluid.
Bulla: a large vesicle
What is a papule? What is a plaque?
Answer 5
Papule: solid elevation of skin up to 1cm in diameter. Often pink, and produced by tissue infiltration of inflammatory cells ir epidemral hypertrophy.
Plaque: a larger, flat-top elevation
What is a pustule?
A small circumscibed elevation of skin filled with pus
What is a nodule?
A circumscribed, palpale mass larger than 1cm in diameter. Usually extends into deeper layers of skin. May be inflammatory or neoplastic.
What are some secondary skin changes?
Scale, crust, hyperkeratosis, exoriation, ulcer, scar, lichenification, hyperpigmentation, fissure, comedo
What is crust vs. scale?
Scale: accumulation fo loose fragments of stratum corneum
Crust: a dried exudate on the surface of a lesion. May form from serum, pus, blood, scales or medications
What is hyperkeratosis?
An increase in thickness pf the horny layer of the skin
Define excoriation
A superficial removal of the epidermis usually caused by self-trauma. Frequently secondary infection occurs.
Ulcer vs erosion
An ulcer always leaves a scar after healing. An erosion is shallower and doesn't penetrate the stratum basale
What is lichenification?
A thickness and hardening of skin characterised by exaggeration of the superficial skin markings. Usually hyperpigmented. Often the result of scratching.
What is a fissure?
A linear cleavage into or thru the epidermis. Occur when skin is inelastic and is subjectedt o acute swelling e.g. at ear margins
What is a comedo?
Pl comedones

A dilated hair follicle filledw ith cornified cells, sebaceous material and micro-organisms. May predispose to bacterial folliculitis. Produced secondary to seborrheic skin disease and tx with greasy medications, or systemic and topical glucocorticoids