Dermatitis: patch testing: 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 · Dermatitis: patch testing

Sample item

Which condition is confirmed by patch testing?

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

The answer and the reasoning

C. Allergic contact dermatitis

Patch testing detects type IV delayed hypersensitivity to contact allergens, with patches removed at 48 hours and read at 48 and 72 to 96 hours. It identifies allergens such as nickel, fragrances and rubber chemicals.

Option by option

  • A. Atopic dermatitis

    Atopic dermatitis is diagnosed clinically; prick tests are not diagnostic.

  • B. Bullous pemphigoid

    Pemphigoid is diagnosed by biopsy and immunofluorescence.

  • C. Allergic contact dermatitis (correct)

    Correct. Patch testing identifies the contact allergen.

  • D. Chronic urticaria

    Urticaria is evaluated by history and sometimes prick tests, not patch testing.

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, Allergic contact dermatitis. Patch testing detects type IV delayed hypersensitivity to contact allergens, with patches removed at 48 hours and read at 48 and 72 to 96 hours.

Why is "Atopic dermatitis" not the answer?

Atopic dermatitis is diagnosed clinically; prick tests are not diagnostic.

Why is "Bullous pemphigoid" not the answer?

Pemphigoid is diagnosed by biopsy and immunofluorescence.

Why is "Chronic urticaria" not the answer?

Urticaria is evaluated by history and sometimes prick tests, not patch testing.

What concept does this question test?

It tests Dermatitis: patch testing in Dermatology. It identifies allergens such as nickel, fragrances and rubber chemicals.

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 Dermatitis: patch testing?

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.