Final answer:
Blue LED light is used to kill bacteria that cause acne, while red LED light reduces inflammation and promotes healing in the skin.
Step-by-step explanation:
The color of LED light that should be used on acne depends on the type of acne being treated. Different colors of LED light have different effects on the skin and can help with various aspects of acne.
Blue LED light is often used to treat acne because it has antibacterial properties. It can help kill the bacteria that cause acne and reduce inflammation in the skin. Blue LED light is effective for treating mild to moderate acne.
Red LED light is often used to reduce inflammation and promote healing in the skin. It can help with the redness and swelling associated with acne. Red LED light is effective for treating mild to moderate acne.