In recent years, home-use 308 excimer phototherapy devices have become increasingly popular among individuals with vitiligo due to their multiple advantages, such as "stable light output with a single wavelength," "ease of use," and "achieving results comparable to hospital-based phototherapy at home."

In recent years, home-use 308 excimer phototherapy devices have become increasingly popular among individuals with vitiligo due to their multiple advantages, such as "stable light output with a single wavelength," "ease of use," and "achieving results comparable to hospital-based phototherapy at home."

The 308nm light directly targets the localized areas of vitiligo, promoting T-cell apoptosis and further activating tyrosinase to help restore the natural growth function of melanocytes. So, what signs indicate that phototherapy is taking effect?

1. Sharpening of Vitiligo Edges

A key indicator of effective phototherapy is when the edges of vitiligo patches transition from being blurry to becoming clearly defined. This typically signifies positive progress in treatment, suggesting that melanocytes in the previously affected areas are beginning to regenerate melanin, making the boundary between the vitiligo patches and normal skin more distinct.

2. Lightening of Vitiligo Patches

As phototherapy takes effect, the color of vitiligo patches may also change. Initially porcelain-white or milky-white patches may gradually become less intense, potentially turning into a lighter white or grayish-white hue. This indicates enhanced activity of melanocytes, which are synthesizing more melanin and gradually bringing the color of the patches closer to that of normal skin.

3. Appearance of Melanin Islands Within Patches

During treatment, patients may notice small, scattered, dot-like dark or dark-brown melanin islands appearing within the vitiligo patches. These melanin islands are areas where melanocytes are actively recovering and producing melanin. As treatment progresses, these islands may gradually expand and merge, ultimately helping to restore normal skin color in the affected areas.

4. Gradual Reduction in Patch Size

The edges of larger vitiligo patches may become clearer and begin to contract inward, leading to a gradual reduction in the overall size of the patches. This signifies that melanocytes are progressively regaining their function, redistributing, and producing melanin, thereby helping the skin's pigment return to normal.

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