Scabies vs. Contact Dermatitis: Differential Diagnosis Case
This case study presents a clinical evaluation of a patient reporting an itchy rash with grey-white linear lesions. While the patient suspects scabies, the clinical presentation does not fully align with a scabies diagnosis. The paper systematically works through the patient's chief complaint, medical history, associated symptoms, and risk factors — including occupational chemical exposure in an oil field — to explore three differential diagnoses: scabies, lichenoid keratosis, and contact dermatitis. The case concludes with a referral to a dermatologist and an outline of a care plan contingent on a confirmed diagnosis.
- Chief Complaint and Symptom Description: Itchy rash with grey-white linear tunnel lesions
- Medical History and Precipitating Factors: Healthy patient with occupational chemical exposure risk
- Symptom Profile and Temporal Factors: Persistent itch, unknown onset, localization unclear
- Assessment and Differential Diagnoses: Scabies unlikely; keratosis and dermatitis considered
- Care Plan and Referral: Dermatologist referral and contingent treatment planning
- References: Citations for scabies and dermatology sources
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What makes this paper effective
- Uses a structured SOAP-adjacent clinical format that mirrors real-world patient evaluation, making it easy for readers to follow the diagnostic reasoning process.
- Demonstrates systematic elimination of diagnoses by weighing symptom presentation against known disease profiles, which is a core clinical reasoning skill.
- Appropriately acknowledges the limits of the clinician's role, recommending dermatologist referral rather than overreaching the nurse practitioner's scope of practice.
Key academic technique demonstrated
The paper demonstrates differential diagnosis reasoning: the student presents the patient's self-reported diagnosis (scabies), then methodically evaluates it against the clinical evidence, introduces competing diagnoses (lichenoid keratosis, contact dermatitis), and weighs each against the patient's history and risk factors. This approach shows how clinical judgment requires both knowledge of disease presentations and awareness of patient-specific context.
Structure breakdown
The paper follows a clinical case-study structure divided into standard assessment categories: chief complaint, precipitating/alleviating factors, associated symptoms, quality and temporal factors, location, sequelae, severity, assessment, differential diagnoses, plan, and target date. This mirrors a formal clinical encounter note and is followed by a short reference list.
Chief Complaint and Symptom Description
The patient's chief complaint is a rash with scratches that appear as tunnels. There are small, grey-white linear lesions with a minute black speck at the closed end. The rash is persistently itchy.
Medical History and Precipitating Factors
There are no obvious precipitating factors. The patient is young and otherwise healthy, maintains a normal diet, and reports no surgeries, history of illness, medications (except OTC Tylenol), or allergies. The patient works in an oil field and may have been exposed to hazardous chemicals in the course of that work, which are common in that industry.
The patient's family does not have any medical history that appears related to the rash. The patient is sexually active with one partner. The patient's financial and living situation is stable. It is not known whether the partner has a similar rash, but this would be important information because scabies is often sexually transmitted (Monsel & Chosidow, 2012).
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