Seborrheic Dermatitis
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Introduction
Affects 1-3% of the population, or over 80% of people living with HIV.
The Case of...
a simple case introducing clincial presentation and calling for a differential diagnosis to get students thinking.
Causes and Risk Factors
Cause is unkown, though the lipophilic yeast Malassezia furfur, associated with tinea versicolor, may be important.
Parkinsonism is associated with increased sebum production and seborrheic dermatitis.
Excess sebum is by no means the root cause, though. Acne is associated with increased sebum, but not dermatitis.
Pathophysiology
Signs and Symptoms
- history
- physical exam
History
Chronic inflammatory dermatitis classically affecting areas with many sebaceous glands (hair-bearing) - scalp, forehead, external auditory canal, retroauricular area, nasolabial folds, and central chess.
Macules and papules on an red-yellow, often greasy base. Typically extensive scaling and crusting is present.
No hair loss.
Dandruff.
Symptoms minimal.
In infants, generally improves with time.
Physical Exam
Investigations
- lab investigations
- diagnostic imaging
Lab Investigations
Diagnostic Imaging
Differential Diagnosis
Treatments
Treatment with antifungal kekonazole may be helpful.
Consequences and Course
Resources and References
Topic Development
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