Hair Removal Using a Pulsed-Intense Light Source

The 1999 document presents findings on hair removal using a pulsed-intense light source. Studies showed that this method can significantly reduce hair density, with varying degrees of effectiveness based on the number of treatments and their timing. Fitzpatrick et al. reported a 64% reduction in hair counts in 45% of patients after 12 weeks with a single treatment. Weiss et al. observed a 63% reduction after 3 months, while Gold et al. saw a 70% reduction at 12 weeks and 75% after one year. Multiple treatments led to an 83% clearance immediately after the fourth treatment and 52% clearance 6 months later in Smith et al.'s study, and a 64% reduction immediately after the second treatment with a 30-40% reduction 6 months later in another study by Weiss et al. Side effects were generally mild and included erythema, blistering, and transient hyperpigmentation, with no permanent pigmentary changes. Histological analysis confirmed thermal necrosis of the hair follicle. The document also notes that the timing of the second treatment is crucial, with twice within one week showing a 45% clearance at 3 months, and that pulse durations longer than 15 milliseconds do not increase efficacy. The most common side effect was erythema, and no scarring or textural changes were reported.