Washington Master Esthetics Practice Exam

Which type of laser or light is recommended for the removal of fine black hair on a client with type I skin?

1. Diode laser

2. Nd:YAG laser

3. Ruby laser

4. Alexandrite laser

The correct answer is: Ruby laser

The ruby laser is specifically effective for the removal of fine, dark hair on individuals with type I skin. This skin type, characterized by high sensitivity and often associated with lighter complexions, responds favorably to wavelengths that can effectively target melanin in hair without damaging surrounding skin tissue. The ruby laser operates at a wavelength of 694 nm, which is well absorbed by the melanin in hair follicles. For clients with type I skin, the laser’s high absorption rate allows for effective destruction of hair follicles while minimizing the risk of side effects such as hypopigmentation or burns, which can occur with less precisely targeted lasers. Other types of laser systems, although effective for hair removal in various skin types, do not adapt as well to the characteristics of fine black hair on a light skin type. The diode and Nd:YAG lasers are typically better suited for darker skin types due to their lower absorption in melanin, making them less effective for treating lighter hair on fair skin. The Alexandrite laser is also effective for hair removal and is a close competitor; however, the ruby laser's specific wavelength makes it particularly suited for this scenario. Therefore, the ruby laser is recommended for effectively and safely treating fine black hair in clients with type I skin