Diagnosis and Management of Skin Disorders Case Study
The prompt asks for lesion type, distribution, colour and ancillary findings first. Naming the diagnosis and working backwards is the mistake this structure exists to prevent.
Editorial process
Last reviewed · August 16, 2026
Describe the lesion before you name the disease
The order the prompt sets is the clinical skill it is teaching. Lesion type, distribution, colour and ancillary findings come first, and the diagnosis emerges from them. Reversing that — recognising the picture and then justifying it — works until the picture is atypical, which is when it matters. So build the description properly. Primary lesion morphology: is this macular, papular, vesicular, plaque? What secondary change is present — scale, crust, lichenification, excoriation? Distribution matters enormously in an 8-month-old, because atopic dermatitis in infancy characteristically involves the cheeks and extensor surfaces and spares the nappy area, a pattern that changes to flexural in older children. Ancillary findings include the generalised xerosis and the rubbing, and the rubbing is itself diagnostic information: pruritus is a defining feature of atopic dermatitis and its absence would push you elsewhere. Write those four descriptors down before you let yourself think of a name for the condition.
Build a real differential before committing. Seborrhoeic dermatitis is the main competitor at this age but tends to be greasier, scalier and less itchy; contact dermatitis follows an exposure pattern rather than a constitutional one; scabies is intensely itchy but involves palms, soles and burrows; and tinea and impetigo have their own morphologies. Say why each is less likely from the findings you described rather than dismissing them. Then make the plan age-appropriate, which is where paediatric dermatology answers most often go wrong. Emollients are the foundation and the quantity matters. Topical corticosteroid potency has to be matched to the site — the face is thin skin and takes a low-potency agent, not the one that works on an adult's forearm — with the duration specified. Add trigger avoidance, bathing advice, and the parent education without which none of it will happen. Say what would make you reconsider the diagnosis.
Likely learning objectives
Inferred from the brief — check these against your own rubric.
- 01Describe a skin lesion in formal dermatological terms before diagnosing it.
- 02Use age-specific distribution patterns as diagnostic evidence.
- 03Construct a differential and exclude each competitor from the findings.
- 04Prescribe topical therapy matched to site, age and potency.
Read the full question
Review every instruction before using the planning guidance that follows.
Turn the brief into deliverables
- 01Lesion type, distribution, colour and ancillary findings.
- 02A differential of at least three conditions with reasons for exclusion.
- 03The most likely diagnosis with justification.
- 04A treatment and management plan with dosages and durations.
- 05Parent education and follow-up parameters.
Morphology, distribution, differential, then management
Morphology
Describe primary and secondary lesion characteristics.
Distribution and colour
Map the involved sites and note what is spared.
Ancillary findings
Bring in xerosis, pruritus and any family history.
Differential diagnosis
Name competitors and exclude each from the findings.
Most likely diagnosis
Commit and justify from the described features.
Management and parent education
Set out emollients, topical therapy, triggers and follow-up.
Dermatology atlases and the guidance behind the plan
Recommended databases
- DermNet NZ
- American Academy of Dermatology
- NCBI Bookshelf
- PubMed Central
Search sequence
- 1.Use a dermatology atlas to check morphology terms against images.
- 2.Confirm the infant distribution pattern for atopic dermatitis before relying on it.
- 3.Check topical steroid potency classes and their facial restrictions.
- 4.Look up emollient quantity guidance; it is specific and rarely quoted.
Reference shortlist
These are authoritative starting points, not a ready-made bibliography. A qualified reviewer must confirm that each source fits the assignment and supports the claim beside which it is cited.
Nothing here is cleared for citation until you have read it.
- 01
What to look for: ABCDEs of melanoma
American Academy of Dermatology · 2024
A worked example of describing lesions systematically before interpreting them.
- 02
IDSA 2014 Guidelines for the Diagnosis and Management of Skin and Soft Tissue Infections
Infectious Diseases Society of America · 2014
Guidance for the infectious differentials you need to exclude.
- 03
Psoriasis Symptoms, Causes, & Risk Factors
National Institute of Arthritis and Musculoskeletal and Skin Diseases · 2023
A comparator inflammatory dermatosis, useful for contrasting morphology.
- 04
Health Literacy
MedlinePlus, National Library of Medicine · 2025
Pitching the parent education so the emollient regimen is actually followed.
- 05
SOAP Notes
StatPearls, NCBI Bookshelf · 2023
SOAP structure for the discussion paper's assessment and plan sections.
Review before submission
Common mistakes
- Naming the diagnosis first and describing the lesion to fit it.
- Ignoring distribution, which is the most useful clue at this age.
- Recommending a corticosteroid potency inappropriate for infant facial skin.
- Omitting emollient quantity and technique, which is where treatment actually fails.
Submission checklist
- Is the lesion described in morphological terms before any diagnosis?
- Does the distribution get used as evidence?
- Is each differential excluded with a reason from the case?
- Are potency, quantity and duration all specified for the topical therapy?
Use this guide to plan and review your own work. Follow your institution's rules and read our academic-integrity policy.
Written by
Aaron Bishop
MA, Education
assignment interpretation and research-methods coaching across disciplines
Aaron leads the EssayCrackers editorial desk. He works on how assignment briefs are read — what a rubric is actually asking for, and where students most often answer a different question than the one set.
Reviewed by
Dr. Nathan Cole
PhD, Rhetoric & Composition
Argumentation and thesis development
Nathan teaches first-year composition and directs a university writing center. He reviews EssayCrackers guides for argumentative soundness and citation accuracy.