Only a few studies, conducted in Sweden, assessed factors associated with the presence of atypical moles in the general population. We conducted a population-based, case-control study in New Hampshire, USA, to identify factors associated with atypical moles. In our study, atypical moles affected 14% of the study population. The adjusted odds ratio (OR) was 0.34 (95% confidence interval (CI) = 0.14-0.80) for those with the highest adulthood recreational sun exposure, relative to the lowest. The OR for any freckles, compared to none, was 2.24 (95% CI = 1.18-4.25). We found a linear relationship between the number of benign moles and the presence of atypical moles (p for trend = 0.0001). The OR was 7.34 (95% CI = 3.03-17.80) for > 15 benign moles, relative to 0-4. Our data indicate that freckles and benign moles, which may reflect melanocytic inducibility, are strongly associated with atypical moles. The inverse association with sun exposure should be considered with caution.

Linda Titus-Ernstoff

Jiao Ding

Ann E Perry

Steven K Spencer

Bernard F Cole

Marc S Ernstoff

Acta Dermato-Venereologica, Supplementum

Acta Dermato-Venereologica, Supplement

Psoriasis: biomolecular, morphological and clinical considerations.

银屑病：生物分子、形态学和临床考量。

Psoriasis: biomolecular, morphological and clinical considerations.

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