Experts from Plastic Surgery Dianping.com said that laser hair removal is generally based on the principle of selective thermodynamics and uses the latest laser technology to remove hair. The beam emitted by the laser machine penetrates the surface of the skin and is eventually absorbed by the hair follicles. Through the selective absorption of laser energy, the hair follicles are damaged and no longer grow hair, without damaging the surrounding tissue. The process of laser hair removal is simple and fast, and generally leaves no scars after treatment. Laser treatment uses a series of laser pulses that cause a stinging or slight burning sensation. Most patients can easily undergo treatment without anesthesia. Topical local anesthetics can be used before treatment on eyelids, perioral areas and other areas.

During treatment, some patients may experience temporary redness or swelling, or even mild skin itching. The redness and swelling subside within a few hours after treatment, and the skin returns to normal. Lasers do not damage the skin, so no treatment is required. There is very little discomfort after treatment and it does not affect normal life and work. The time required to treat different parts of the body is also different. It takes 5 to 10 minutes to treat the lip and beard area, 30 to 40 minutes to treat the hair on the lower legs, and about 90 minutes to treat the hair on the lower limbs.

Laser removes hair by destroying hair follicles, and the growth of hair follicles is divided into growth, resting and regression phases. The hair follicles in the growth phase contain the most melanin and absorb the light emitted by the laser the most, making them the best targets for laser hair removal machines. The more melanin, the clearer it is, the higher the hit rate, and the more destructive it is to hair follicles. Laser has little effect on catagen hair follicles and has no effect on telogen hair follicles.

So some hair may still regenerate after hair removal, but the new hair will become thinner and less obvious. The effect varies from person to person. Some people will grow hair after 6 months, but Some people may not regenerate until 2 years later. Because some hair follicles are in the resting and catagen phases at any time, multiple treatments are required to achieve the effect of destroying hair follicles. It takes 3 to 4 times to remove the hair on the limbs, with an interval of 1 to 2 months. Some patients who treat beards on their upper lips sometimes require 7 to 8 treatments.