Dermatology Textbook•Trichology, Acne & Hidradenitis Suppurativa•Hair, Follicular & Apocrine Disorders
1. Alopecia Areata (Trichoscopy & SALT Score)
- Trichoscopy: Exclamation mark hairs, yellow dots, black dots, short vellus hairs.
- SALT Formula:
0.40 × Vertex + 0.18 × Right + 0.18 × Left + 0.24 × Posterior. SALT ≥ 50 qualifies for oral JAK inhibitors (Baricitinib / Ritlecitinib).
2. Hidradenitis Suppurativa (IHS4)
- IHS4 Formula:
(Nodules × 1) + (Abscesses × 2) + (Draining Tunnels × 4)(Mild ≤3, Moderate 4–10, Severe ≥11). First-line biologics: Adalimumab, Secukinumab, Bimekizumab.
3. Isotretinoin Cumulative Target (120–150 mg/kg)
- Avoid concomitant Tetracyclines (Doxycycline/Minocycline) due to Pseudotumor Cerebri risk; enforce 1-month post-therapy contraception washout.
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How to Cite
Cutisight. "Alopecia Areata, Hidradenitis Suppurativa & Isotretinoin Cumulative Dosing." Encyclopedia of Dermatology [Internet]. 2026. Available from: https://cutisight.com/education/trichology-adnexal/alopecia-areata-and-hs/salt-ihs4-and-isotretinoin
This is an open-access resource. Please cite appropriately when using in academic or clinical work.