The ideal candidate for laser hair removal is a patient with very fair skin and very dark, coarse hair. This is due to the fact that treatments target and destroy pigment-producing melanin cells. Since it is easier to focus on a dark object against a light background, it makes sense that a dark follicle is easier to destroy against light epidermis that is low in melanin.
However, patients with all types and shades of skin and hair may still be good candidates for laser hair removal treatments. The first step in achieving desired results is to seek out a highly-qualified doctor or specialist with extensive experience in your particular skin and hair type. Patients with lots of melanin in their epidermis require special laser wavelengths and pulse settings to achieve maximal results without unwanted or risky side effects.
The Nd:YAG laser has the longest wavelength with the least amount of absorption by melanin and is most preferred for treatment of patients with a lot of melanin in their epidermis. Improper use of a laser with a shorter wavelength may result in burning, scarring or loss of pigment. Be sure to thoroughly discuss your questions and concerns with your doctor or specialist before undergoing treatment.
Source: http://www.youtube.com/watch?v=twf1oNpceF4
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