NIC Esthetician Written ExamTreatment ProceduresHard
A client presents with Fitzpatrick skin type VI and desires a hair removal method for her underarms that provides long-term reduction without the risk of hyperpigmentation. She has heard about various laser options. Which laser wavelength is generally considered the safest and most effective for permanent hair reduction on Fitzpatrick skin type VI?
- AAlexandrite laser (755 nm)
- BNd:YAG laser (1064 nm)
- CRuby laser (694 nm)
- DDiode laser (810 nm)
Show answer & explanationAnswer & explanation
Correct answer: B. Nd:YAG laser (1064 nm)
The Nd:YAG laser (1064 nm) has the longest wavelength, allowing it to bypass the melanin in the epidermis of darker skin types (Fitzpatrick VI) and safely target the hair follicle, significantly reducing the risk of hyperpigmentation or burns.
Why the other options are wrong
- A. Alexandrite laser (755 nm) has a shorter wavelength and is highly absorbed by melanin, making it effective for lighter skin but very risky for Fitzpatrick VI due to high potential for burns and PIH.
- C. Ruby laser (694 nm) has the shortest wavelength and is strongly absorbed by melanin, making it highly unsuitable and dangerous for hair removal on darker skin types.
- D. Diode laser (810 nm) is moderately absorbed by melanin. While safer than Alexandrite for darker skin, it still carries a higher risk of adverse effects on Fitzpatrick VI compared to Nd:YAG.
Nd:YAG Laser for Dark Skin
A specific type of laser (Neodymium-doped Yttrium Aluminum Garnet) with a 1064 nm wavelength that is safe and effective for hair removal on darker skin types (Fitzpatrick IV-VI) due to its deep penetration and low melanin absorption in the epidermis.
- Wavelength: 1064 nm
- Penetrates deeply, bypassing epidermal melanin
- Minimizes risk of hyperpigmentation and burns on dark skin
- Effective for permanent hair reduction
- Requires multiple sessions
Memory trick: Long Wavelengths Leave Dark Skin Loving Lasers.