Related Experiment Video
Updated: Jan 23, 2026

Light/dark Transition Test for Mice
Published on: November 13, 2006
Dermatoscopic features of Koebner phenomenon in lichen planus on light and dark skin
Claudio Conforti1, Roberta Vezzoni1, Anna Moret1
1Dermatology Clinic, Maggiore Hospital, University of Trieste, Trieste, Italy.
Abstract:
The Koebner phenomenon is well described and well known in clinical practice. Sometimes it can take on a linear appearance, the diagnosis of which can be facilitated by the use of dermatoscopy. In this case, we present a comparison between a linear Koebner phenomenon on light and dark skin, reporting the salient dermatoscopic characteristics and relating them to histopathology.
Related Concept Videos
Tip-of-the-Tongue Phenomenon
Dark Triad and Person Perception
COPD: Pathogenesis and Clinical Features
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
Light Acquisition
Light as Energy
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
Special Features of Adaptive Immunity
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...

