Milady Esthetics State Board Practice Test 2025 - Free Esthetics Exam Practice Questions and Study Guide

Blue light is primarily used for treating skin blemishes because it has been shown to have effective antibacterial properties. It is particularly beneficial for those with acne-prone skin, as it helps to kill the acne-causing bacteria, Propionibacterium acnes, and reduces the inflammation associated with breakouts. Blue light therapy can penetrate the skin at a specific wavelength that targets these bacteria without harming the surrounding skin cells.

In contrast, white light encompasses a broad spectrum and is used in various applications, but it does not specifically target acne and blemishes as effectively as blue light. Purple light combines red and blue light, which is not specifically focused on the treatment of skin blemishes. Yellow light is often used to reduce redness and improve skin tone but does not have the same direct impact on acne-related issues. Therefore, blue light is the most suitable option for those looking to treat skin blemishes.