The onset of vitiligo often catches people off guard, and at the beginning, patients are usually uncertain about how to proceed with treatment. Should they apply medication or opt for phototherapy? When is the right time to start phototherapy? In the past, it was believed that the progressive stage relied on medication, while phototherapy was mainly reserved for the stable stage. However, as our understanding of vitiligo deepens, this perspective has been revised.

The onset of vitiligo often catches people off guard, and at the beginning, patients are usually uncertain about how to proceed with treatment. Should they apply medication or opt for phototherapy? When is the right time to start phototherapy? In the past, it was believed that the progressive stage relied on medication, while phototherapy was mainly reserved for the stable stage. However, as our understanding of vitiligo deepens, this perspective has been revised.

I. When Should Phototherapy Begin?

Ultraviolet phototherapy, with its dual effects of immunosuppression and repigmentation promotion, is one of the important treatments for vitiligo. If there are no contraindications, vitiligo patients should start phototherapy as early as possible. Phototherapy can be applied throughout the entire treatment process and is suitable for both progressive and stable stages of vitiligo.

In terms of treatment strategies, patients in the progressive stage require early intervention, typically involving immunomodulatory medications combined with low-dose phototherapy. This approach helps control disease progression while initiating repigmentation. For the stable stage, a combination of medication and phototherapy is often the primary approach.

This combined strategy of "medication to control progression + phototherapy to promote repigmentation" helps enhance treatment efficacy and shorten the overall treatment duration. This is especially important for patients with segmental vitiligo, who should start phototherapy as early as possible. The longer the duration of segmental vitiligo, the more resistant it becomes to treatment. Therefore, it is recommended to begin phototherapy within six months of the onset of segmental vitiligo.

II. What Should Be Considered for Phototherapy During the Progressive Stage?

The progressive stage is a critical phase in the development of vitiligo, and controlling the dosage during phototherapy is extremely important. Inappropriate light doses may cause skin burns, leading to the spread of white patches and negatively impacting treatment. Patients in the progressive stage should, under the guidance of professionals, carefully determine the initial treatment dose and the gradual increase plan to ensure the effectiveness and safety of the treatment.

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