A 72-year-old man was referred for this scaly lesion on his scalp.
Clinical and dermoscopic evaluation were in favor of a keratotic type of seborrheic keratosis.
Dermoscopy revealed:
- an unspecific pattern (white to yellow horn masses over a background brown coloration)
- peripheral hairpin vessels
Seborrheic keratoses in most cases are clinically and dermoscopically diagnosed.
Main dermoscopic signs are:
- milia-like cysts
- comedo-like openings (crypts, pseudo follicular openings)
- fissures and ridges ("brain-like" or cerebration's appearance)
- fingerprint-like structures
- moth-eaten border
- hairpin blood vessels
- network-like structures
- sharp demarcation
- fat fingers
In our case, dermoscopic examination reveals hairpin blood vessels which is a typical local sign of seborrheic keratosis.
