Skin Injuries and Lesions Overview

Alopecia refers to the loss of hair, which can vary in severity and can be influenced by factors such as hormonal changes or disease.

Hyperpigmentation is the increased production of melanin from existing melanocytes, commonly seen in conditions like melanosis.

A comedo is a dilated hair follicle filled with cornified cells and sebaceous material, notably seen in dogs with hyperadrenocorticism (Cushing's syndrome).

<p>Lichenification refers to the thickening and hardening of the skin with exaggeration of superficial markings, often due to chronic irritation.</p> Signup and view all the answers

<p>Effluvium describes excessive shedding of hair, which can be triggered by various stressors or health conditions.</p> Signup and view all the answers

<p>Hypertrichosis is the condition of having more hair than normal, while hypotrichosis refers to having less hair than normal.</p> Signup and view all the answers

<p>Leukoderma is a condition characterized by decreased pigmentation of the skin, often due to a lack of melanocytes or their failure to produce melanin.</p> Signup and view all the answers

<p>An epidermal collarette appears as a circular rim of keratin flakes following the loss of the 'roof' of a vesicle or pustule, often indicating previous inflammation or infection.</p> Signup and view all the answers

<p>Primary lesions are direct results of the underlying disease process and arise from the same organ. They are significant diagnostically because they provide crucial insights into the specific condition affecting the skin.</p> Signup and view all the answers

<p>A macule is an area of altered skin color up to 1 cm, while a papule is a small, round solid elevation of the skin that is also 1 cm in size. The key difference lies in the elevation; a macule is flat while a papule is raised.</p> Signup and view all the answers

<p>A vesicle is a well-circumscribed elevation of the epidermis less than 1 cm in diameter filled with clear fluid. In contrast, a bulla is larger than 1 cm and is also filled with fluid.</p> Signup and view all the answers

<p>A tumor is a large mass that implies neoplasia and can involve any structure of the skin or subcutis, whereas a cyst is an epithelial lined cavity containing fluid or solid material. Tumors generally indicate abnormal growth while cysts are typically benign.</p> Signup and view all the answers

<p>A wheal is a smooth, sharply circumscribed elevation of skin due to dermal edema, often seen in allergic reactions or hypersensitivity disorders. It commonly occurs in conditions affecting horses and less frequently in dogs.</p> Signup and view all the answers

<p>Secondary lesions evolve from primary lesions and are caused by processes such as self-trauma or altered keratinization. They are considered less important diagnostically compared to primary lesions.</p> Signup and view all the answers

<p>Pustules are small, circumscribed elevations of the epidermis that are filled with pus. They typically indicate an infection or inflammatory process in the skin.</p> Signup and view all the answers

<p>An abscess is a small, circumscribed accumulation of pus within the epidermis or within a follicle. Its presence is significant as it often indicates an underlying infection that requires treatment.</p> Signup and view all the answers