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Concerning Phototherapy & Psoriasis (Psoriasis vulgaris - Nummular psoriasis - Plaque psoriasis), ultraviolet phototherapy (especially narrowband UVB and PUVA) is an established, guideline‑recommended treatment for psoriasis, but the devices and light sources are generally cleared/authorized as medical devices rather than “drug approvals” like classical FDA/EMA drug marketing authorizations
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