Dermoscopy of Dermatofibroma

Diagnostic accuracy of dermatoscopy for melanocytic and nonmelanocytic pigmented lesions

“…Nonmelanocytic pigmented lesions frequently examined by dermatoscopy are seborrheic keratoses, solar lentigines, lichen planuselike keratoses (LPLK) (also known as benign lichenoid keratoses), dermatofibromas, basal cell carcinomas (BCC), pigmented Bowen disease, pigmented actinic keratoses, and pigmented inflammatory conditions. [4][5][6][7][8][9][10][11][12][13][14] It is still unknown as to whether dermatoscopy also improves the diagnostic accuracy for these lesions.…”

Homogeneous blue pigmentation in dermatofibroma simulating a blue naevus

“…2 The typical dermoscopic feature of a dermatofibroma is a central white patch with a surrounding delicate, regular, usually light brown, pigment network, which allows a definitive diagnosis in most instances. 1,3,4 Blue naevi are usually small, relatively regular, sharply circumscribed papules or nodules with a uniform bluegrey colour. The typical dermoscopic feature of blue naevi is a homogeneous blue pigmentation without local features such as pigment network, streaks, brown globules or black dots.…”

Histopathologic tissue correlations of dermoscopic structures

“…The typical network usually corresponds to the junctional component of a nevus. However, reticulation can also be seen in darkly pigmented normal skin and heavily pigmented rete ridges as encountered in dermatofi bromas (Zaballos et al, 2008;Puig et al, 2005;Arpaia et al, 2005). (b) The atypical network is irregularly meshed with lines that vary in width and degree of pigmentation and with "holes" that are heterogeneous in area and shape ( Fig.…”