Texas Esthetician License Practice Exam

What type of skin has a blue-white appearance under a Wood's lamp?

1. Dehydrated skin

2. Oily skin

3. Normal, healthy skin

4. Combination skin

The correct answer is: Normal, healthy skin

Under a Wood's lamp, normal, healthy skin typically exhibits a blue-white fluorescence. This specific appearance indicates that the skin's pH is balanced and that it has a healthy moisture level without significant abnormalities or conditions. The blue-white glow suggests that the skin is well-hydrated and functioning properly, reflecting the absence of issues like excessive oiliness or dehydration that could alter its appearance. Other skin types would have different presentations under the Wood's lamp. For instance, dehydrated skin may present as a dull or darker shade, and oily skin might have a more yellow or greenish hue due to the excess sebum and potential bacterial activity. Combination skin can show varying effects based on the areas analyzed, further straying from the clear blue-white indication of normal healthy skin.