Which photofacial filter wavelength is primarily associated with melanin, particularly for Fitzpatrick skin type 1-3?

The correct choice, 560 nm, is associated with melanin absorption, particularly in the context of treating pigmentation issues in Fitzpatrick skin types 1-3. This wavelength falls within the range that is commonly used in light treatments aimed at addressing vascular lesions and pigmentation.

For Fitzpatrick skin types 1-3, which are characterized by lighter skin that may tan poorly or not at all, treatments at this wavelength target melanin effectively while minimizing the risk of damage to surrounding tissues. The 560 nm filter is particularly advantageous since it provides a good balance of penetration and selectivity, allowing for the treatment of superficial skin conditions such as sun spots or age spots while sparing the deeper layers.

When considering the other wavelengths, 420 nm tends to be more effective for targeting superficial vascular lesions rather than melanin. The 590 nm wavelength is also useful in treating pigmentation but does not have the same level of efficacy specifically for melanin as 560 nm does. Lastly, 640 nm is primarily utilized for deeper vascular targets and is not as effective for superficial pigmentation compared to 560 nm. Thus, 560 nm is clearly recognized for its specific application in addressing melanin-related issues in lighter skin types.