The wavelength will affect the depth the light will travel into the skin. Tanning Booths emit UVA which is of longer wavelength and goes deeper into the skin. Very little visible light is absorbed by living cells unless the cells are pigmented. This pigmentation includes melanin and red corpuscles and is called chromophores. Chromophore means color bearing.
Infrared light can pass through the body.
Infrared is also known as heat light. You can get infrared heat from an electric or gas heater. The only known effect of infrared light on skin is dilation of blood vessels that transport blood to and from the skin for cooling. Electrologists use the electricical energy to produce a chemical change within the hair follicle. This is accomplished by attaching an electrode carrying a positive charge of electricity that is conducted by the electrolytes that react like metals in the body.