UVB phototherapy uses controlled 311 nm narrowband UVB light to treat stubborn skin conditions like psoriasis, vitiligo, and eczema. Backed by decades of research, it’s drug-free, non-invasive, safe for special populations, and effective—with 60–80% psoriasis clearance. It involves 2–3 weekly clinic/home sessions, with results in weeks (psoriasis) to months (vitiligo).