Dermatology Quiz on Hair Loss and Skin Disorders
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Questions and Answers

What is a common manifestation of contagious pustular dermatitis in sheep and goats?

  • Fever and lethargy
  • Foul-smelling discharge from the eyes
  • Hyperplastic lesions on the ears
  • Crusts around the nose and lips (correct)

Which viral disease is associated specifically with epithelial tissue involvement?

  • Bovine viral diarrhea (BVD)
  • Foot and mouth disease (FMD) (correct)
  • Scrapie
  • Canine distemper

What type of infectious agent can enter the body via hair follicles?

  • Only viral agents
  • All types of infectious agents (correct)
  • Bacterial agents only
  • Only parasitic agents

Which of the following is NOT a characteristic of viral skin diseases?

<p>Exclusively affects humans (D)</p> Signup and view all the answers

What type of skin lesions are primarily seen during the viremia phase of systemic viral infections?

<p>Vesicular to pustular (C)</p> Signup and view all the answers

What is one of the primary diagnostic methods for identifying viral skin diseases?

<p>Skin biopsy (C)</p> Signup and view all the answers

What is the condition characterized by an absence of hair?

<p>Alopecia (A)</p> Signup and view all the answers

What type of virus is associated with the condition known as scrapi?

<p>A prion disease (D)</p> Signup and view all the answers

Which animal is primarily affected by contagious ecthyma?

<p>Sheep and goats (D)</p> Signup and view all the answers

Which condition results from the incomplete development of the stratified squamous epithelium?

<p>Epitheliogenesis Imperfecta (A)</p> Signup and view all the answers

In which areas do gross lesions typically occur in photosensitization?

<p>Poorly pigmented hair and skin (A)</p> Signup and view all the answers

What are the common effects of hypotrichosis on animals?

<p>Increased susceptibility to infections (C)</p> Signup and view all the answers

What type of injury is specifically categorized under chemical injury?

<p>Local application of toxins (B)</p> Signup and view all the answers

What physical injury can be caused by repeated licking or chewing due to psychological issues?

<p>Lick dermatitis (B)</p> Signup and view all the answers

During acute solar dermatitis, which symptom is typically observed first?

<p>Erythema (A)</p> Signup and view all the answers

What is a characteristic gross lesion seen in solar dermatitis over time?

<p>Thickened inflamed skin (C)</p> Signup and view all the answers

Study Notes

Types of Hair Loss

  • Alopecia: Complete absence of hair.
  • Hypotrichosis: Reduced hair amount, increasing susceptibility to sunburn and infections.

Connective Tissue Disorders

  • Collagen Dysplasia: Characterized by hyper-extensibility and laxity of connective tissues.

Epitheliogenesis Imperfecta

  • Incomplete development of stratified squamous epithelium affecting skin, adnexa, or oral mucosa.

Environmental Induced Skin Diseases

  • Sun Injury: Caused by actinic (sun) damage and direct environmental factors.
  • Chemical Injury: Local penetration through skin or systemic absorption leading to tissue damage.
  • Physical Injury: Includes abrasions, lacerations, ulcerations, exposure to extremes in temperature, and foreign bodies.

Sunburn and Solar Dermatitis

  • Caused by endothelial damage and keratinocyte injury, creating inflammatory responses.
  • Acute Symptoms: Redness, pain, possible edema and blistering.
  • Chronic Symptoms: Thickened inflamed skin, potential dysplasia or neoplasia; commonly affects ventral abdomen and thorax.

Photosensitization

  • Activation of photodynamic substances leading to skin damage under UV-A or visible light.
  • Type I: Exogenous agents, often from plants or drugs.
  • Type II: Aberrant endogenous factors.
  • Type III (Hepatogenous): Impaired removal of chlorophyll metabolites.
  • Type IV: Unknown causes.
  • Affects areas with poorly pigmented hair and skin.

Psychogenic Dermatitis

  • Develops from persistent licking or chewing due to emotional or psychological stress.
  • Common triggers include boredom, anxiety from environmental changes, or loss of companions.

Infectious Skin Diseases

  • Categories include viral, bacterial, mycotic, parasitic, and protozoal skin diseases, with various entry routes including trauma, hair follicles, and skin glands.

Viral Skin Diseases

  • Local Infections: Mainly caused by poxviruses affecting multiple animal species.

    • Contagious Pustular Dermatitis: Parapoxvirus affecting sheep and goats, can be fatal in young animals. Characterized by vesicles and crusts typically on lips.
  • Systemic Infections: Involves viruses like canine distemper and bovine viral diarrhea (BVD).

    • Diagnosis includes clinical history, skin biopsy showing dermatitis, serology, and PCR.

Specific Viral Diseases

  • Foot and Mouth Disease (FMD): A severe systemic viral infection impacting livestock.
  • Papilloma Virus: Affects canine and bovine species, leading to verrucous lesions on skin.

Pyoderma

  • Superficial Pyoderma: Presents as erythematous dermatitis with notable epidermal collarettes.

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Description

Test your knowledge on various types of hair loss, connective tissue disorders, and environmental skin diseases. This quiz covers conditions like alopecia, sunburn, and epitheliogenesis imperfecta. Understand the causes, symptoms, and implications of these dermatological issues.

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