The prevalence of PPP was 38.3% in <25 years, and 11.4% in >50 years (P < 0.001). [...] In the younger age group, the prevalence of PPP was 26.5% in circumcised participants, and 42.4% in uncircumcised participants (P < 0.05)
Pearly penile papules (PPP) are small raised bumps that are frequently found around the corona. They're sometimes mistaken for genital warts, and can cause significant embarrassment. Although frequently found in partners of women with cervical intraepithelial neoplasia, there is little evidence of a causative role, and PPP are frequently (it seems) considered harmless.
Agha's findings are consistent with those of Rehbein in 1977, who reported:
there was a significantly increased incidence of pearly penile papules in Negroes and uncircumcised men. [...] The incidence of papules was greatest in young adults and tended to decrease with increasing age.