Nonmelanoma skin cancers are the most common neoplasms in the United States, with an incidence rate close to that of all noncutaneous neoplasms combined.1 Clinical trials have shown that the regular use of sunscreen can reduce the rate of appearance of precancerous lesions.2,3 Others have shown that the efficacy of a sunscreen is dependent on its proper application.4
Gaughan MD, Padilla RS. Use of a Topical Fluorescent Dye to Evaluate Effectiveness of Sunscreen Application. Arch Dermatol. 1998;134(4):515–517. doi:
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