A light therapy face mask uses LEDs to deliver specific wavelengths of light to the skin, triggering a process called photobiomodulation that stimulates cellular energy, boosts collagen, and aids in skin repair and rejuvenation. Different colors target various concerns, with red light for aging signs like wrinkles and dark spots, blue light for acne, and near-infrared for deep collagen stimulation. Devices offer at-home solutions for issues like fine lines, dullness, and acne, though professional treatments are often more powerful and effective.