Challenge Your Exam Readiness With Our Free Esthetician Practice Questions

Blue LED light penetrates the epidermis and targets Propionibacterium acnes bacteria, the primary cause of inflammatory acne lesions. The light activates porphyrins within the bacteria, producing free radicals that destroy them. Red light (choice A) penetrates more deeply and stimulates collagen and circulation, making it ideal for anti-aging and healing. Green light (choice B) helps reduce pigmentation and redness. Yellow light (choice D) supports lymphatic flow and reduces inflammation but is not primarily antibacterial. Estheticians use blue LED therapy as a non-invasive, safe adjunct to acne facials. Treatment protocols often combine red and blue light for synergistic effects—reducing bacteria and calming inflammation simultaneously. Proper training is necessary to ensure correct wavelength and duration while screening for contraindications such as photosensitivity or certain medications.