Meyerson's nevus

A 50-year-old man consulted for a pruritic pigmented lesion on his abdomen which rapidly changed with a peripheral erythema in favor of a Meyerson's nevus.

1a - Clinical view: eczematous halo around a pigmented nevus (before treatment)

Dermoscopy revealed a peripheral erythema circumsbring a pigmented lesion with a negative pigment network and regression areas.

1b - Dermoscopy: negative pigment network.

A short corticosteroid topical treatment was prescribed and after 10 days, the eczematous halo was less important. Dermoscopy revealed blue-gray areas in favour of regression.

2a -Clinical view after a corticosteroid topical treatment (10 days)

2b - Dermoscopic view: after a corticosteroid topical treatment.
Globular pattern with some blue-gray areas in favor of regression.

Because of these signs of regression, the lesion was excised. Pathology was in favour of a benign Meyerson's nevus.

Strawberry appearance

Facial non pigmented actinic keratoses (AKs) display 4 main dermoscopic features:

1. erythema, with a pink-to-red pseudonetwork surrounding the hair follicles
2. white-to-yellow surface scale
   
3. fine, linear-wavy vessels surrounding the hair follicles
   
4. hair follicle openings filled with yellowish keratotic plugs and/or surrounded by a white halo
   

These features combined to produce a strawberry’ appearance.

Strawberry appearance in a non pigmented AK

Strawberry appearance in a slightly pigmented AK

Other cases of AKs:
1

Literature:
I. Zalaudek, J. Giacomel, G. Argenziano, R. Hofmann-Wellenhof, T. Micantonio, A. Di Stefani, M. Oliviero, H. Rabinovitz, H.P. Soyer, K. Peris (2006) Dermoscopy of facial nonpigmented actinic keratosis. British Journal of Dermatology 2006: 155 (5) , 951–956

Dermatofibroma with vascular structures

A 54-year-old woman consulted for a firm reddish tumor on her left thigh.
Dermoscopy revealed a central scarlike white patch in favor of a dermatofibroma and peripheral vascular structures: peripheral erythema and linear-irregular vessels.

peripheral erythema and linear-irregular vessels

Vascular structures are found in 29 to 49% of dermatofibromas, including erythema, dotted vessels, coma vessels, hairpin vessels, glomerular vessels, telangiectasias, linear-irregular vessels, polymorphous/atypical vessels.

Litterature:
Dermoscopy of dermatofibromas. A Prospective Morphological Study of 412 Cases
P. Zaballos, S. Puig, A. Llambrich, J. Malvehy, Arch Dermatol. 2008;144(1):75-83