Washington Master Esthetics Practice Exam

What type of LED is used for treating hyperpigmentation?

1. Red, 640 nm

2. Blue, 415 nm

3. Green, 525 nm

4. Yellow, 590 nm

The correct answer is: Green, 525 nm

The use of green LED light, specifically at 525 nm, has been shown to be effective in treating hyperpigmentation. This wavelength of light works by targeting excess melanin production in the skin, which is the primary factor contributing to hyperpigmentation. Green light penetrates the skin at a depth that allows it to influence the melanin-producing cells (melanocytes), helping to even out skin tone and reduce the appearance of dark spots and discoloration. In contrast, other wavelengths like blue light, while useful in treating acne due to their antibacterial properties, are not specifically effective for hyperpigmentation. Red light is often used for anti-aging and promoting collagen production, while yellow light can help with redness and inflammation but does not directly address hyperpigmentation. Thus, green light stands out as the specialized treatment for this particular skin concern.