Here is a comprehensive visual overview of Alopecia Areata from the medical textbook library:
Alopecia Areata - Clinical Images
1. Classic Patchy Alopecia Areata (Scalp)
A single well-circumscribed, smooth oval patch of hair loss on the scalp - the most common presentation:
Fig. 87-1 - Patch of alopecia areata with mild peachy erythema and some fine residual hairs (Fitzpatrick's Dermatology)
2. Patchy Alopecia Areata (Multiple Confluent Patches)
Multiple patches coalescing across the scalp, with white/gray hairs typically spared:
Fig. 87-2 - Patient with patchy alopecia areata (Fitzpatrick's Dermatology)
3. Alopecia Areata with Exclamation Point Hairs
Close-up showing residual broken short hairs at the patch edge - the pathognomonic "exclamation point" hairs (tapered proximally, blunt distally):
Fig. 87-4 - Patch of alopecia areata with exclamation point hairs (Fitzpatrick's Dermatology)
4. Alopecia Totalis
Complete loss of all scalp hair:
Fig. 87-3 - Patient with alopecia areata totalis (Fitzpatrick's Dermatology)
5. Eyebrow Involvement
Loss of eyebrows - a characteristic extra-scalp manifestation:
Fig. 87-5 - Patient with alopecia areata of the eyebrows (Fitzpatrick's Dermatology)
6. Pathogenesis Diagram
The underlying mechanism - CD8+ T cells attack the hair bulb, causing premature catagen transition (and why JAK inhibitors work):
Fig. 13-4 - Mechanism of alopecia areata and role of JAK inhibitors (Fitzpatrick's Dermatology)
Key Clinical Clues at a Glance
| Feature | Description |
|---|
| Patch shape | Round/oval, well-demarcated, smooth scalp |
| Exclamation point hairs | Short, tapered at base - at patch borders |
| Black dots | Broken-off hair stubs in follicular openings (dermoscopy) |
| Yellow dots | Empty follicles filled with keratin/sebum (dermoscopy) |
| Nail pitting | Grid-like pitting in ~10% of patients |
| White hair sparing | Pigmented hairs targeted; white/gray hairs often spared |
| Variants | Patchy → Ophiasis → Totalis → Universalis |
(Sources: Fitzpatrick's Dermatology, Andrews' Diseases of the Skin, Dermatology 2-Volume Set 5e)