Dermatitis and Psoriasis: Skin Inflammatory Disorders

From the study guide

Course Outline

  1. Pruritus Causes
  2. Eczema Types
  3. Atopic Dermatitis
  4. Contact Dermatitis
  5. Seborrheic Dermatitis
  6. Psoriasis Pathogenesis
  7. Psoriasis Subtypes
  8. Pityriasis Rosea
  9. Lichen Planus

1. Pruritus Causes

Key Concepts & Definitions

  • Pruritus: An unpleasant sensation that provokes the desire to scratch, often associated with skin or systemic conditions.
  • Xerosis (Dryness): The most common cause of pruritus, characterized by dry, rough, and scaly skin, leading to itchiness.
  • Primary Skin Diseases: Skin conditions directly causing pruritus, including inflammatory, infectious, or infestational dermatoses such as eczema, psoriasis, or scabies.
  • Systemic Causes: Underlying internal diseases that manifest with pruritus, including liver, kidney, thyroid diseases, infections, malignancies, and neuropsychiatric disorders.
  • Eczema (Dermatitis): An inflammatory skin disease marked by pruritus, redness, and skin changes, classified as acute or chronic.
  • Contact Dermatitis: Skin inflammation resulting from contact with external irritants or allergens, presenting as eczematous plaques or vesicles.

Essential Points

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Practice quiz preview

1. What is the most common cause of pruritus?

2. What is the prevalence of atopic dermatitis in children and adults according to the provided content?

3. What is the primary role of atopic dermatitis in skin health and disease?

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Flashcard preview

Atopic dermatitis — key feature?

Chronic, itchy, dry, flexural skin.

Eczema types — examples?

Atopic, contact, seborrheic, stasis, nummular.

Pruritus causes — common?

Xerosis, skin diseases, systemic illnesses.

Pruritus — definition?

Unpleasant sensation provoking scratching.

Xerosis — main cause of?

Most common cause of pruritus.

Primary skin diseases — example?

Eczema, psoriasis, scabies.

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