ABSTRACT
Dermatofibromas are common, benign, fibrous skin lesions that clinically appear as firm papules or nodules located mainly on the lower extremities of young or middle-aged adults. Histopathologically, dermatofibromas are characterized by an increased number of fibrocytes in the dermis and a variable admixture of inflammatory cells, coarse collagen bundles, and blood vessels. The overlying epidermis is usually hyperplastic and hyperpigmented, which is the main reason why their color clinically is usually light brown or dark brown. The most frequent dermoscopic pattern associated with dermatofibromas is the combination of a central white scar-like patch surrounded by a delicate pigment network. Vascular structures are very common in dermatofibromas. The blood vessels are more conspicuous when viewed with polarized noncontact dermoscopy devices. The most frequent vascular structures found in dermatofibromas are erythema, dotted vessels, comma vessels, and hairpin vessels. Another dermoscopic pattern associated with non-pigmented dermatofibromas is the presence of a white scar-like patch that occupies the whole lesion.
