Comma vessels

This is a case of dermal nevus located on the back of a woman.

Comma vessels are well observed on this picture taken with a polarized light dermoscope. Milia-like cysts are present but they are less marked than on pictures taken with dermoscope using immersion principle.

Comma vessels are frequently observed in dermal nevi but can be observed too in atypical nevi.

Globular pattern

27-year-old woman with an asymetrically pigmented nevus on her right arm.


Dermoscopy: asymetric globular pattern (eccentric hyperpigmentation on the left). No excision was necessary for this benign dermal nevus which was followed-up every 12 months.