CLINICAL EVALUATION OF HANDHELD SELF-TREATMENT DEVICE FOR HAIR REMOVAL

       Traditional hair-removal methods such as waxing, shaving, and chemical depilatory treatments are often inconvenient. Permanent methods such as electrolysis are painful, expensive, and have a risk of adverse effects.  Areas typically treated include the face, neck, axillae, back, and extremities. Laser and light-based techniques have gained popularity in recent years. Laser procedures target melanin in the hair bulb. When melanin absorbs laser energy of the appropriate wavelength, the absorbed energy is converted to heat that selectively destroys the hair bulb. The presence of melanin in the epidermis limits the efficiency of laser-based procedures for hair removal because part of the laser energy is absorbed by epidermal melanin. In subjects with dark skin and light-colored hair, the concentration of melanin is high in the epidermis and low in the hair. When these subjects are treated with laser energy, the epidermis may be damaged because so much of the laser energy is absorbed by the highly concentrated epidermal melanin. Conversely, epidermal damage is reduced in subjects with dark hair and light skin because the concentration of melanin in the hair is higher than in the epidermis. For these reasons hair removal is more successful in subjects with dark hair and light skin, and subjects with darker skin, including tanned skin, have a greater risk of blistering and pigmentary alteration. 


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