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To the Editor:—
Dr. Resnik's answer to the treatment for chloasma (208:159, 1969) did not state what type of sunscreen is to be used and why.The Meirowsky phenomenon he mentioned occurs one hour after sun exposure at wave lengths above 3,200 A and only darkens preformed melanin in all the epidermal cells. Almost all stimulation of melanin production occurs between 2,800 and 3,200 A (the sunburn spectrum) and the usual trade sunscreens block out only this range. A total sunscreen, the benzophenone-type derivative, would be needed to prevent tanning and, therefore, darkening of the skin in both ranges, above and below 3,200 A.
Wolfe EM. Sunscreens for Chloasma. JAMA. 1969;209(1):112. doi:10.1001/jama.1969.03160140068019
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