Infestations: dermoscopy of scabies: 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 · Infestations: dermoscopy of scabies

Sample item

Dermoscopy of a scabies burrow shows a dark triangular structure with a linear track behind it. How is this sign described?

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

The answer and the reasoning

A. Delta-wing jet with contrail

The dark triangle is the head and anterior legs of the mite and the trail is the burrow, resembling a jet with a contrail. It allows rapid noninvasive diagnosis.

Option by option

  • A. Delta-wing jet with contrail (correct)

    Correct. This is the dermoscopic sign of scabies.

  • B. Starburst pattern

    Starburst pattern describes Spitz naevus.

  • C. Comma vessels

    Comma vessels are seen in dermal naevi.

  • D. Wickham striae

    Wickham striae occur in lichen planus.

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 A, Delta-wing jet with contrail. The dark triangle is the head and anterior legs of the mite and the trail is the burrow, resembling a jet with a contrail.

Why is "Starburst pattern" not the answer?

Starburst pattern describes Spitz naevus.

Why is "Comma vessels" not the answer?

Comma vessels are seen in dermal naevi.

Why is "Wickham striae" not the answer?

Wickham striae occur in lichen planus.

What concept does this question test?

It tests Infestations: dermoscopy of scabies in Dermatology. It allows rapid noninvasive diagnosis.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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 Infestations: dermoscopy of scabies?

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.