Pigmentary disorders: targeted excimer phototherapy: practice question

A Dermatology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dermatology · Pigmentary disorders: targeted excimer phototherapy

Sample item

Which phototherapy modality delivers 308 nm light selectively to small localised vitiligo patches?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. Excimer laser or lamp

The 308 nm excimer laser or lamp delivers targeted narrowband UVB to localised vitiligo patches, sparing uninvolved skin, and it can work faster than whole-body narrowband UVB. It suits limited disease and facial lesions. Generalised disease is treated with whole-body NB-UVB.

Option by option

  • A. Infrared lamp

    Infrared lamps provide heat only.

  • B. Visible blue light

    Blue light is used in acne.

  • C. Excimer laser or lamp (correct)

    Correct. Excimer sources emit 308 nm light for targeted therapy.

  • D. Broadband UVA

    Broadband UVA is used with psoralens in PUVA.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Dermatology question

What is the answer to this Dermatology question?

The best answer is C, Excimer laser or lamp. The 308 nm excimer laser or lamp delivers targeted narrowband UVB to localised vitiligo patches, sparing uninvolved skin, and it can work faster than whole-body narrowband UVB.

Why is "Infrared lamp" not the answer?

Infrared lamps provide heat only.

Why is "Visible blue light" not the answer?

Blue light is used in acne.

Why is "Broadband UVA" not the answer?

Broadband UVA is used with psoralens in PUVA.

What concept does this question test?

It tests Pigmentary disorders: targeted excimer phototherapy in Dermatology. It suits limited disease and facial lesions. Generalised disease is treated with whole-body NB-UVB.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Pigmentary disorders: targeted excimer phototherapy?

Learn each condition by its primary lesion, site and signature sign. Then use the flashcards and the other Dermatology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.