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Abstract
Background: Acne vulgaris as a chronic inflammatory disease of the pilosebaeous unit is the most common skin disorder regardless of gender, skin colour or ethinity .No mortality associated with acne ,but significant physical and psychological morbidity.Acne therapies, topical or systemic, targeting one of its pathogenic factors have many drawbacks. Laser and light therapy greatly enhance acne vulgaris management. Promising results with infrared laser had been reported. Photobiostimulation of acne vulgaris was more effective than many pharmacological products Objective :To evaluate the effectiveness of Low Level Laser Therapy for treatment of acne vulgaris in adolescents . Methods: Half-face of twenty cases ,four males and sixteen females between eleven and eighteen years treated with 905 -nm Giotto diode laser for thirty minutes. The other half exposed to sham light .Two sessions per week for eight weeks and three month follow up after treatment was done