Utah Master Esthetician Practice Exam

What effect does blue LED light have on skin?

1. Increases melanin production

2. Reduces bacteria

3. Enhances blood flow

4. Promotes collagen breakdown

The correct answer is: Reduces bacteria

Blue LED light is primarily known for its antibacterial properties, particularly in the treatment of acne. This light works by targeting the bacteria known as Propionibacterium acnes (P. acnes) that contributes to the formation of acne lesions. By reducing the presence of this bacteria on the skin, blue LED light can help to diminish future breakouts, leading to clearer skin. In contrast, other options relate to effects that blue LED light does not typically have. For instance, increasing melanin production is more associated with UV radiation rather than blue light. Enhancing blood flow is generally linked to red or infrared light treatments, which stimulate circulation. Additionally, promoting collagen breakdown would be counterproductive in skincare, as treatments typically aim to preserve or promote collagen production for youthful-looking skin. Overall, the specific role of blue LED light in skincare is best characterized by its ability to reduce bacteria.