Purpuric pigmented dermatoses represent a form of chronic, recurrent capillaritis characterized by petechiae and purpuric macules over the lower limbs. We report three female cases who presented with clinical features of purpuric pigmented dermatosis with unusual histopathologic features. The first patient had golden-brown pigmented purpura over bilateral knees, shins and dorsal feet. The secon...

Small pigmented lesions in children can represent a significant diagnostic challenge. If the diagnostic features and therapeutic approach are relatively well established in large and giant nevi, there is still much controversy regarding small and intermediate-sized congenital pigmented lesions that can lead to significant diagnostic challenges, both clinically and dermoscopically, and consequen...

The aim of this study was to assess the frequency of classic dermoscopic basal cell carcinoma (BCC) features and the sensitivity of new descriptors, such as light brown nests (homogeneous and structured) only visible employing a high magnification digital videomicroscope. A retrospective analysis of 2,024 highly magnified digital images referring to 400 BCCs was performed by 3 independent obser...

Pigmented contact dermatitis (PCD) is a noneczematous variant of contact dermatitis, characterized clinically by hyperpigmentation with little or no signs of dermatitis. The term “pigmented contact dermatitis” was coined by Osmundsen, a Danish dermatologist who described an epidemic of melanosis in Copenhagen.[1] In a series of excellent observations and investigations, he proved that the melan...

Pigmented villonodular synovitis is a disorder resulting in a villous, nodular, or villonodular proliferation of the synovium, with pigmentation related to the presence of hemosiderin. These lesions are almost exclusively benign with rare reports of malignancy. Pigmented villonodular synovitis can occur in a variety of joints and at any age but most often occurs within the knee in the young adu...

Twenty years of laser dermatology has resulted in current technology which allows variable spot sizes, different wavelengths, and a variety of effective cooling devices. These developments have made the treatment of cutaneous pigmented and vascular lesions safe and efficacious by targeting selected chromophores while minimizing damage to the surrounding tissue. Vascular lesions are targeted by ...

Pigmented Bowen's disease is a rare subtype of in situ squamous cell carcinoma of the skin and mucosa, with a potential risk of invasion and metastasis. It is universally accepted that human papillomavirus (HPV) is the cause of genital Bowen's disease. Herein we report an unusual case of pigmented Bowen's disease of the genital area that clinically simulated malignant melanoma. Accurate diagnos...

The extent of the horizontal visual field was determined behaviourally in 4 pigmented and 5 albino ferrets (Mustela putorius furo, Carnivora, Mammalia) using perimetry. During binocular vision, all pigmented and three albino ferrets responded equally well to stimuli presented anywhere along the horizontal perimeter in the central 180 degrees of the visual field. The remaining two albinos had a ...

A 57-year-old man presented with a solitary flat pigmented lesion on his face, which had appeared two years previously and was slowly enlarging over time. Physical examination revealed a flat pigmented lesion, 8 mm in size, on the patient’s right cheek. The clinical diagnosis was suggestive of a solar lentigo (SL) because of the symmetric shape, the regular border, and the homogenous brown colo...