Final answer:
Comedones, characteristic of acne, do not fluoresce under a Wood's lamp; they have no specific color change because they are not fungal in nature.
Step-by-step explanation:
Comedones are skin lesions characteristic of acne, which manifest as whiteheads and blackheads. These are clogged hair follicles that appear differently based on their exposure to air. Under a Wood's lamp, which emits ultraviolet light, various skin conditions can be examined for diagnostic purposes. Comedones do not have a specific fluorescence color under a Wood's lamp since they are not of fungal origin. Unlike tinea infections, which would fluoresce, comedones are related to the clogging of pores and oxidation of lipids and do not show any specific color change under UV light. However, other substances on the skin might fluoresce, providing contrast to the comedones.