Papulosquamous disorders: inverse psoriasis: 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 · Papulosquamous disorders: inverse psoriasis

Sample item

A man has well-demarcated, glistening red plaques with little scale in the axillae, inframammary folds and natal cleft, with a negative KOH mount. What is the diagnosis?

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

The answer and the reasoning

B. Inverse (flexural) psoriasis

Inverse psoriasis involves flexures with smooth, shiny, well-defined red plaques because friction and moisture remove scale. Negative KOH and absence of satellite pustules argue against fungal infection. Low-potency steroids, calcineurin inhibitors or vitamin D analogues are used.

Option by option

  • A. Erythrasma

    Erythrasma shows coral-red fluorescence.

  • B. Inverse (flexural) psoriasis (correct)

    Correct. Smooth flexural plaques with negative KOH indicate inverse psoriasis.

  • C. Tinea cruris

    Tinea cruris has an active scaly margin and positive KOH.

  • D. Candidal intertrigo

    Candidal intertrigo has satellite pustules.

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.

More Dermatology questions

Questions about this Dermatology question

What is the answer to this Dermatology question?

The best answer is B, Inverse (flexural) psoriasis. Inverse psoriasis involves flexures with smooth, shiny, well-defined red plaques because friction and moisture remove scale.

Why is "Erythrasma" not the answer?

Erythrasma shows coral-red fluorescence.

Why is "Tinea cruris" not the answer?

Tinea cruris has an active scaly margin and positive KOH.

Why is "Candidal intertrigo" not the answer?

Candidal intertrigo has satellite pustules.

What concept does this question test?

It tests Papulosquamous disorders: inverse psoriasis in Dermatology. Negative KOH and absence of satellite pustules argue against fungal infection. Low-potency steroids, calcineurin inhibitors or vitamin D analogues are used.

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 Papulosquamous disorders: inverse psoriasis?

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.