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Dermatologic Conditions & Diseases Flashcards

7 cards from real CDT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Erythema chronicum migrans, the hallmark rash of Lyme disease, is caused by which organism?

    Answer: Borrelia burgdorferi

    Borrelia burgdorferi, transmitted by Ixodes ticks, causes the expanding annular 'bull's-eye' rash of Lyme disease known as erythema migrans.

  2. A patient with HIV presents with violaceous nodules on the lower extremities. Which diagnosis should be considered first?

    Answer: Kaposi sarcoma

    Kaposi sarcoma, associated with HHV-8, presents as violaceous macules, plaques, or nodules and is strongly linked to HIV/AIDS.

  3. Necrobiosis lipoidica is most commonly associated with which systemic condition?

    Answer: Diabetes mellitus

    Necrobiosis lipoidica is strongly associated with diabetes mellitus, presenting as yellowish-brown plaques on the shins.

  4. What is the Koebner phenomenon?

    Answer: Development of skin lesions at sites of trauma in susceptible individuals

    The Koebner (isomorphic) phenomenon refers to the appearance of skin lesions characteristic of a disease at sites of cutaneous trauma, seen in psoriasis, vitiligo, and lichen planus.

  5. Which subtype of rosacea is characterized primarily by persistent facial erythema and telangiectasia without papules or pustules?

    Answer: Erythematotelangiectatic rosacea

    Erythematotelangiectatic rosacea (subtype 1) presents with central facial flushing, persistent erythema, and visible blood vessels without inflammatory lesions.

  6. A patient presents with thick, hyperkeratotic skin on the palms and soles from birth. Which hereditary condition does this suggest?

    Answer: Palmoplantar keratoderma

    Palmoplantar keratoderma (PPK) is a group of hereditary disorders characterized by diffuse or focal thickening of the skin on palms and soles.

  7. Dermatitis herpetiformis is associated with which underlying condition?

    Answer: Celiac disease (gluten-sensitive enteropathy)

    Dermatitis herpetiformis is the cutaneous manifestation of celiac disease, caused by IgA deposits at the dermal-epidermal junction, presenting with intensely pruritic vesicles.