Sun exposure is uncontrolled and can cause sunburn, which may trigger new patches and make vitiligo more noticeable. NB‑UVB uses a specific wavelength at a carefully controlled dose to reduce inflammation and stimulate repigmentation—without the broader UV exposure from sunlight.
July 21
Great question — it can feel contradictory! The key difference is control. Uncontrolled sun exposure can irritate vitiligo-affected skin, causing redness or discoloration. Narrowband UVB (NB-UVB) phototherapy uses a very specific wavelength of ultraviolet light (311–313 nanometers) delivered in precise, measured doses — Show Full Answer
Great question — it can feel contradictory! The key difference is control. Uncontrolled sun exposure can irritate vitiligo-affected skin, causing redness or discoloration. Narrowband UVB (NB-UVB) phototherapy uses a very specific wavelength of ultraviolet light (311–313 nanometers) delivered in precise, measured doses — making it far more targeted and predictable than general sun exposure. Here's what NB-UVB actually does for vitiligo:
- Stimulates melanocytes — the pigment-producing cells lost in vitiligo — to regenerate and restore color
- Calms the immune system's attack on those melanocytes
- Boosts the effectiveness of other treatments like topical medications and JAK inhibitors
Phototherapy is actually the only currently approved treatment that actively stimulates melanocytes to bring color back to white patches — medications alone can't do that. Results take time and consistency. On average:
- 25% improvement after 3 months
- 50% improvement after 6 months
- 75% improvement after 9 months
It's worth noting that if treatment stops, repigmentation can fade over time, so maintenance may be needed. Always work with a dermatologist to find the right approach for your skin.
July 19
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