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Updated: May 7, 2026

Dermoscopy Aids in the Diagnosis of Discoid Lupus Erythematosus
Published on: May 16, 2025
Special locations dermoscopy: facial, acral, and nail
Luc Thomas1, Alice Phan, Pauline Pralong
1Department of Dermatology, Centre Hospitalier Lyon Sud, Université Claude Bernard Lyon 1, Piere Bénite Cedex 69495, France.
Abstract:
Although dermoscopy reflects the anatomy, skin anatomy is different on facial and acral skin as well as in the nail unit. Malignant patterns on acral sites include the parallel ridge pattern and irregular diffuse pigmentation, whose presence should lead to a biopsy. Malignant patterns on the face include features of follicular invasion (signet-ring images, annular granular images, and rhomboidal structures) and atypical vessels. Malignant patterns on the nail unit include the micro-Hutchinson sign and irregular longitudinal lines.
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