2 colors, 1 diagnosis

A 45-year-old woman was referred for this pigmented lesion with 2 colors.

Diagnosis was easy with dermoscopy:

• comedo-like openings 
• milia-like cysts
• fissures and ridges 
• network-like structures
• sharp demarcation

in favor of a seborrheic keratosis

Hairpin blood vessels

A 52-year-old man consulted for this inguinal exophytic pigmented tumour.


Dermoscopy revealed fissures and ridges (black rectangle) and a vascular pattern with many hairpin blood vessels (red rectangle).

Pictures taken with Fotofinder dermoscope

Hairpin blood vessels and fissures and ridges were in favor of a seborrheic keratosis.

Hairpin blood vessels are quite typical of seborrheic keratoses (particularly if there is a white halo surrounding them) but are non specific and can be found also in:

• melanocytic nevi
• keratoacanthomas
• basal cell carcinomas
• melanomas (often thick and irregular)
  

Globule-like structures and ring-like structures

A 45-year-old man consulted for a pigmented firm tumor on his right shoulder.
Firm aspect on palpation and dermoscopic feature were in favor of a dermatofibroma.


Brown globule-like structures and ring-like structures (red circle) were observed.

Globulelike structures are formed because the rete ridges are often flat, confluent, and hyperpigmented .
Ringlike structures are a kind of globule with a darker peripheral rim.

Fissures and ridges were also displayed in this case (arrows)

The most frequent dermoscopic patterns observed in dermatofibromas are the central white
scar- like patch and the peripheral delicate pigment network.
Globule-like structures, ring-like structures, fissures and ridges are less usual structures in this kind of tumor.


Recent litterature about dermoscopy of dermatofibromas:
Pedro Zaballos, Susana Puig, Alex Llambrich, Josep Malvehy. Dermoscopy of Dermatofibromas. A Prospective Morphological Study of 412 Cases. Arch Dermatol. 2008;144(1):75-83

Other cases of dermatofibromas
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