Hair loss (alopecia) is a common problem and is often a major source of distress for patients. The differential diagnosis of alopecia includes both scarring and nonscarring alopecias. In addition, many hair shaft disorders can produce hair shaft fragility, resulting in different patterns of alopecia. Therefore, an organized and systematic approach is needed to accurately address patients' complaints to achieve the correct diagnosis. Part 1 of this 2-part continuing medical education article on alopecia describes history taking and the clinical examination of different hair loss disorders. It also provides an algorithmic diagnostic approach based on the most recent knowledge about different types of alopecia.Le texte complet de cet article est disponible en PDF.
Key words : alopecia areata, androgenetic alopecia, discoid lupus erythematosus, dissecting cellulitis, hair, lichen planopilaris, patterned hair loss, telogen effluvium, trichoscopy
| Funding sources: None.
| Conflicts of interest: Dr Shapiro has financial relationships with Allergan, Advisory Board, Honorarium; Applied Biology, Consultant, Honorarium; Dr Reddy's Laboratories Ltd, Speaker, Honorarium; Johnson & Johnson, Consultant, Honorarium; Merck & Co, Speaker, Fees; and RepliCel Life Sciences, Founder, Stock. The other authors involved with this journal-based CME activity have reported no relevant financial relationships with commercial interest(s).