A 10-year retrospective study compared oral-PUVA, bath-PUVA, and UVA-1 therapies for granuloma annulare, finding that while all methods had similar response rates, UVA-1 phototherapy had the fewest side effects. Researchers analyzed 73 completed phototherapy cycles in 58 patients and concluded that all therapies provided benefit, with UVA-1 and bath-PUVA therapies being preferred options due to their favorable adverse event profiles and demonstrated efficacy.

Source: Photochemical & Photobiological Sciences