Blue light induced transient localized acne post photodynamic therapy: A case report.

Abstract

Phototherapies including LED light therapy and photodynamic therapy (PDT) are commonly used safe treatment for inflammatory acne. However, there was few report about combination of the two methods on the same patient. We reported a special and rare case of blue light induced transient localized acne post PDT. A 32-year-old male with a history of moderate to severe acne for 3 years. He was successfully treated by 3 sessions of modified red light 5-aminolevulinic acid (ALA) PDT without adverse events during the treatment. However, when he received blue and red LED light therapy as maintenance one week post the last ALA-PDT, severe localized acne burst on his nose. Subsequently, he received single red light treatment for a month, combined with oral administration of doxycycline for the first week. His severe acne on the nose was recovered eventually. No recurrence was observed later.