Red light therapy (RLT) effectively treats mild-moderate inflammatory acne by reducing inflammation, boosting collagen, and aiding healing, with 36–77% lesion reduction (per studies). Safe, non-invasive, works best as an adjunct, needing 4–8 weeks of consistent use.
Blue (405–420 nm) and red (630–660 nm) LED therapy treats acne by targeting bacteria and reducing inflammation. Consistent 4–8-week use matters; device choice depends on coverage. Safe, complementary to routines.