What is the benefit of using a Wood's lamp for skin analysis?

Using a Wood's lamp for skin analysis is beneficial primarily because it helps identify skin conditions. This specific tool emits ultraviolet light, which causes certain skin conditions to fluoresce or change color. Under the Wood's lamp, various skin issues such as hyperpigmentation, fungal infections, and oily or dehydrated areas become more visible. This allows estheticians to assess the skin's health with greater precision, leading to more accurate treatments and recommendations.

The other options, while related to skin health, do not directly pertain to the primary purpose of a Wood's lamp. Enhancing skin hydration, improving skin tone, and promoting blood flow are effects that can be achieved through various treatments but are not functions of the Wood's lamp itself. The tool is specifically designed for diagnostic purposes rather than for treatment enhancements.