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Most Frequently Tested Dermatology Topics (MRCP Part 1)

TL;DR: 

Dermatology is a small but high-yield section in MRCP Part 1, and the most frequently tested dermatology topics (MRCP Part 1) include psoriasis, eczema, immunobullous disease, drug reactions, and classic infections. Questions reward pattern recognition and linking rashes to systemic clues. Focus on a compact list of conditions, practise with MCQs, and review common traps such as drug lists, mucosal involvement, and blister characteristics.


Why this matters

Dermatology questions in MRCP Part 1 tend to be short, image-free, and clinically straightforward—yet many candidates drop marks due to pattern-matching errors. The specialty contributes a modest proportion of the exam, making it an efficient scoring area if you know what examiners repeatedly test. For foundation reading, start with our MRCP Part 1 overview.


The Most Frequently Tested Dermatology Topics (MRCP Part 1)


1) Psoriasis

  • Chronic plaques on extensor surfaces; silver scale; Auspitz sign.

  • Triggered by infections (strep), stress, alcohol, and drugs (β-blockers, lithium, antimalarials).

  • Associated with metabolic syndrome and psoriatic arthritis. Why it’s tested: Distinguishing plaque psoriasis from eczema and knowing when systemic therapy is indicated. Authoritative source: NHS evidence summary — https://www.nhs.uk/conditions/psoriasis/

2) Atopic & Contact Dermatitis

  • Atopic dermatitis: flexural distribution, barrier dysfunction, Staph aureus colonisation.

  • Allergic contact dermatitis: delayed type IV hypersensitivity; patch testing.

  • Irritant contact dermatitis: occupational patterns (cleaners, healthcare, hairdressers).Why it’s tested: Differentiating allergic from irritant patterns is a frequent MCQ theme.

3) Immunobullous Disorders

  • Pemphigus vulgaris: flaccid bullae + mucosal involvement; IgG against desmoglein.

  • Bullous pemphigoid: tense bullae in elderly; pruritic; IgG against BP180/BP230.

  • Dermatitis herpetiformis: intensely itchy clusters; coeliac link; responds to dapsone. Why it’s tested: Tense vs flaccid blister is one of the quickest exam discriminators. Authoritative source: Derm Net bullous disease overview — https://dermnetnz.org/topics/bullous-pemphigoid

4) Drug Eruptions

  • Morbilliform rash (most common).

  • Urticaria, photosensitivity (doxycycline, amiodarone).

  • Severe: DRESS (rash + eosinophilia), SJS/TEN (mucosal involvement).Why it’s tested: MRCP loves medication lists—always scan for newly added anticonvulsants, antibiotics, or allopurinol. Source: NICE Medicines Safety — https://www.nice.org.uk/about/what-we-do/patient-safety

5) Cutaneous Infections

  • Impetigo: honey-coloured crusts; non-bullous vs bullous.

  • Cellulitis vs erysipelas: systemic involvement and anatomical boundaries.

  • Dermatophyte infections: annular, central clearing, scaling borders. Why it’s tested: Classic rash patterns + common pathogens.

6) Lupus & Cutaneous vasculitis

  • Discoid lupus: scarring, pigment change, ear involvement.

  • Vasculitis: palpable purpura, systemic symptoms, drug associations. Why it’s tested: Systemic links and laboratory clues (ANA, complements) are often embedded into stems.

7) Erythema multiforme & urticaria

  • EM: target lesions, HSV-related; distinguish from SJS/TEN.

  • Urticaria: wheals <24 hours, angio-oedema red flags. Why it’s tested: Differentiation from drug hypersensitivity syndromes is essential.

8) Erythema nodosum & panniculitis

  • Tender nodules on shins. Causes: sarcoidosis, infections, pregnancy, IBD, drugs. Why it’s tested: Conditions that trigger EN frequently appear across MRCP specialties.


Table: Short Checklist of High-Yield Dermatology Conditions for MRCP Part 1

Topic

Must-Know Points

Quick Exam Trigger

Psoriasis

Triggers, arthritis, nail signs

Extensor plaques + silver scale

Atopic dermatitis

Flexural rash, barrier dysfunction

Young adult with asthma/eczema

Bullous pemphigoid

Tense blisters, elderly

Urticarial prodrome + tense bullae

Pemphigus vulgaris

Flaccid bullae + mucosa

Painful erosions in mouth

DRESS

Eosinophilia + rash

New anticonvulsant/allopurinol

SJS/TEN

Mucosal erosions, systemic illness

Targetoid rash + prodrome

Tinea infections

Annular lesions, KOH

Central clearing

Infographic of the most frequently tested dermatology topics in MRCP Part 1, including psoriasis, eczema, drug reactions, and skin infections.

Practical examples / mini-cases

MCQ Example

A 76-year-old man presents with several days of widespread pruritic, tense blisters on an erythematous base. Mucosa is spared. Which is the most likely diagnosis?

A) Pemphigus vulgarisB) Bullous pemphigoidC) Dermatitis herpetiformisD) Toxic epidermal necrolysis

Correct answer: B — Bullous pemphigoid

  • Elderly patient

  • Tense bullae

  • No mucosal involvement

  • Pruritus precedes eruption

This exact pattern appears frequently in MRCP stems.


Common pitfalls (5 bullets)

  • Confusing pemphigus with pemphigoid — always check blister tension and mucosal involvement.

  • Over-diagnosing SJS/TEN — look for systemic illness + mucosal erosions.

  • Missing drug causes — anticonvulsants, allopurinol, sulfonamides are high-yield offenders.

  • Misidentifying fungal infections — central clearing and scaling edges are exam giveaways.

  • Ignoring systemic associations — psoriasis (arthritis), dermatitis herpetiformis (coeliac), EN (sarcoid/IBD).

FAQs

1) What is the hardest dermatology topic in MRCP Part 1?

Many candidates struggle with immunobullous disorders because differentiating pemphigoid from pemphigus requires careful reading. Blister tension and mucosal involvement are the key clues.

2) How many dermatology questions appear in MRCP Part 1?

The exact number varies between sittings, but typically Dermatology represents a small portion of the exam. However, the topics are predictable and therefore high-yield.

3) Should I memorise drug rashes for MRCP?

Yes—drug eruptions are commonly tested. Focus on DRESS, morbilliform eruptions, photosensitivity, and SJS/TEN triggers.

4) Are images included in MRCP Part 1 Dermatology questions?

The exam is primarily text-based. Questions rely on pattern recognition from narrative descriptions, not images.

5) How should I revise Dermatology efficiently?

Limit your study to 8–12 recurring conditions and practise with timed MCQs. Use our Free MRCP MCQs and Start a mock test to reinforce learning.


Ready to start?

Dermatology is one of the most efficient scoring sections of MRCP Part 1 when you know the recurrent exam themes. Strengthen your recall and pattern recognition with Crack Medicine’s Free MRCP MCQs and structured mock tests. For full, consultant-led teaching across all major subjects, explore our focused lectures.


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