Permanent hair removal for underarm hair removal can be done with laser hair removal, which is virtually harmless to the body. However, it is necessary to understand the risks and contraindications of the procedure. Laser hair removal, also known as laser hair removal, is based on the principle of selective photothermal, by adjusting the pulse width, wavelength and energy of the laser, the laser penetrates the surface layer of the skin and reaches the root of the hair. Hair follicles are rich in melanin can absorb light and heat, the local temperature rises rapidly, so that the hair follicle tissue necrosis, hair loss regeneration ability. Laser hair removal can be maintained for a long period of time and can achieve permanent hair removal, and there are generally no side effects or harm to the body. Laser hair removal may have risks and contraindications to the procedure, and after the procedure, there may be pain, erythema, edema, burns, hyperpigmentation, hypopigmentation, folliculitis, acne-like scarring and so on. It is recommended to communicate with your doctor before the procedure and also to understand the contraindications of the procedure. After laser hair removal, there may be local redness of the skin, swelling of the hair follicles, burning sensation at the treatment site and other manifestations, you can use ice packs ice, but also pay attention to the local hydration, can help relieve.