<unk>  HPV infections have an estimated prevalence in the US of 10–20% and clinical manifestations in 1% of the sexually active adult population. US incidence of HPV infection has increased between 1975 and 2006. About 80% of those infected are between the ages of 17–33. Although treatments can remove<unk> s, they do not remove the HPV, so<unk> s can recur after treatment (about 50–73% of the time).<unk> s can also spontaneously regress (with or without treatment). Traditional theories postulated that the virus remained in the body for a lifetime. However, studies using sensitive DNA techniques have shown that through immunological response, the virus can either be cleared or suppressed to levels below what polymerase chain reaction (PCR) tests can measure. One study testing<unk>  skin for subclinical HPV using PCR found a prevalence of 10%.
Genital wart
Skin tag
Genu recurvatum
Condylomata lata
Trichostasis spinulosa
Molluscum contagiosum
Bifid penis
Squamous cell carcinoma