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ABD Photodermatology and UV Effects Flashcards

6 cards from real ABD 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. Which idiopathic photodermatosis is the most common, affecting up to 10-20% of the population in temperate climates?

    Answer: Polymorphous light eruption (PMLE)

    Polymorphous light eruption (PMLE) is the most common idiopathic photodermatosis, presenting with pruritic papules, plaques, or vesicles on sun-exposed skin in spring/summer.

  2. UVA radiation (320-400nm) primarily penetrates to which level of the skin?

    Answer: Dermis

    UVA radiation penetrates deeply into the dermis, reaching dermal fibroblasts and blood vessels, and is the primary driver of photoaging and tanning through oxidative mechanisms.

  3. How does photoallergic contact dermatitis differ from phototoxic dermatitis?

    Answer: Photoallergic reactions require prior sensitization and involve a Type IV immune response

    Photoallergic reactions require prior sensitization, involve a Type IV delayed hypersensitivity immune response, and can spread beyond directly sun-exposed sites.

  4. Hydroa vacciniforme is associated with latent infection with which virus?

    Answer: Epstein-Barr virus (EBV)

    Hydroa vacciniforme and hydroa vacciniforme-like lymphoproliferative disorder are strongly associated with Epstein-Barr virus (EBV) infection.

  5. The Fitzpatrick skin phototype classification system categorizes human skin into how many phototypes?

    Answer: 6

    The Fitzpatrick scale classifies skin into 6 phototypes (I-VI) based on constitutive pigmentation and the skin's response to UV exposure (burning versus tanning).

  6. Which chemical sunscreen UV filter is the most common cause of photoallergic contact dermatitis in the United States?

    Answer: Oxybenzone (benzophenone-3)

    Oxybenzone (benzophenone-3) is the most frequent cause of sunscreen-related photoallergic contact dermatitis, identified in multiple patch-test surveillance studies.