The papules appear as one or several rows of small, pearly or flesh-colored, smooth, dome-topped bumps situated circumferentially around the corona or sulcus of the glans. They may range in size from less than 1 mm to 3 mm. As of 1999, different studies have produced estimates of incidence ranging from 8 to 48 percent of all men. Studies suggest that it occurs more often on younger men and those who have not been circumcised. One study found them in 33.3% of uncircumcised males and 7.1% of circumcised males.