Using a black light, or Wood's light, can help dermatologists determine disease extent of melasma, according to a study published in the Journal of the American Academy of Dermatology (JAAD).
Melasma is most common among women, and often appears during pregnancy due to hormonal changes, leading many to refer to it as "the mask of pregnancy." When left undiagnosed, the brown and gray spots on the skin continue to darken and can alter a patient's appearance and quality of life.
"In some cases, melasma can be very difficult to detect with the naked eye," said Neelam Vashi, MD, Boston Medical Center, Boston, Massachusetts. "Using a black light allows us to assess the extent of the disease and counsel patients on sun protection measures and treatment options."
A black light detects changes in colour or fluorescence in the skin, making pigment disorders appear to shine under the light. It has been suggested as an aid in diagnosing melasma depth, but this is the first study to find a significant quantitative difference between viewing the skin under natural light versus under a black light when evaluating extent in those with subtle disease.
"Early detection is critical in treating this disease before it worsens," said Dr. Vashi. "Without the use of a black light, the extent of the disease could go unnoticed and worsen over time with ultraviolet ray exposure or laser therapy. Treatment for melasma needs to be maintained, otherwise there is risk of the condition returning."
Melasma treatments include topical creams, chemical peels, microdermabrasion, and sun protection. Researchers recommend that women protect themselves by applying sunblock every 2 hours when out in the sun or avoiding sun exposure altogether for those with a genetic predisposition, who are pregnant or have a known family history of melasma.
SOURCE: Boston University Medical Center
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