Laser armpit hair removal is the use of laser selective photothermal action principle, through the adjustment of laser wavelength, energy and pulse width, so that the laser penetrates the skin surface and reaches the hair root follicle, the light energy is absorbed and converted into heat energy that can destroy the hair follicle tissue, so that the hair loses its ability to regenerate without damaging the tissue around the hair follicle. Of course, any technology is a double-edged sword, laser hair removal, must choose the appropriate parameters, wavelength and energy, while weighing the patient’s skin color and the state of the skin, if the choice is not careful, laser hair removal may bring the following hazards: 1, the immediate reaction when the laser is just done, there may be pain, red spots, there will also be small blisters and other discomfort, at this time you can use cool water, ice 2, if the laser energy is large, can cause local blisters, exudation, then need to reduce the energy and cold compress, can avoid blisters, or may leave a mark; 3, the most serious adverse reactions after laser surgery is pigmentation or hypopigmentation, but with the extension of time, can basically recover on their own. Overall, the harm and benefit of laser armpit hair removal is very small in comparison.