A visible tan line on a woman whose skin has been darkened by ultraviolet exposure, except where covered<unk>  or simply tanning is the process whereby skin color is darkened or tanned. It is most often a result of exposure to ultraviolet (UV) radiation from<unk> light or from artificial sources, such as a tanning lamp found in indoor tanning beds. People who deliberately tan their skin by exposure to the<unk>  engage in a passive recreational activity of<unk>  bathing. Some people use chemical products which can produce a tanning effect without exposure to ultraviolet radiation, known as<unk> less tanning.
Sun tanning
Indoor tanning
Bodywork 
Douche
Seed cycling
Wrinkle
Arctic Sun medical device
Dental instrument