What is the primary purpose of using a Wood lamp in dermatologic assessments?

• A. To detect fluorescent materials in the skin and hair
• B. To detect bacterial colonies
• C. To measure skin elasticity
• D. To assess hydration

Answer: (A)

Wood lamp examination relies on ultraviolet light to make certain substances in the skin and hair glow. The main purpose is to detect fluorescent materials, such as fungal elements and bacterial pigments, which helps identify infections like tinea versicolor or tinea capitis and to visualize pigmentary changes. This glow provides a visual cue that isn’t visible under normal light, guiding diagnosis and location of lesions. It isn’t used to measure skin elasticity or hydration, and it doesn’t involve counting bacterial colonies.