Histologic evaluation of a millisecond Nd:YAG laser for hair removal

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Abstract
Background Hirsutism and hypertrichosis are common problems. Laser‐assisted hair removal has recently become a popular method to remove unwanted hair. However, histologic changes of the hair follicle after exposure to laser continue to require further investigation. Objective To determine the thermal effect of a millisecond Nd:YAG hair removal laser. Methods Six patients with black hair were treated with 50 msec pulsed Nd:YAG laser at fluences 30, 50 or 100 J/cm2. Histologic examinations were performed on each laser‐treated site at 24–72 hours after laser exposure. Results Fluence–dependent selective thermal injury to follicles was seen. The average depth of acute laser injury at fluences 30, 50 and 100 J/cm2 were 1.06, 0.85 and 1.11 millimeters, respectively. Conclusions Long‐pulsed millisecond Nd:YAG lasers produce selective thermal damage of hair follicles. Varied laser fluences used in this study did not statistically alter the degree of thermal injury. Lasers Surg. Med. 28:159–161, 2001.

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