Hiroshima atomic bombing survivors showing numerous burn scars, including<unk> s Persons of any age can develop a<unk> . Children under 10 are less likely to develop<unk> s, even from ear piercing.<unk> s may also develop from Pseudofolliculitis barbae; continued shaving when one has razor bumps will cause irritation to the bumps, infection, and over time<unk> s will form. Persons with razor bumps are advised to stop shaving in order for the skin to repair itself before undertaking any form of hair removal. The tendency to form<unk> s is speculated to be hereditary.<unk> s can tend to appear to grow over time without even piercing the skin, almost acting out a slow tumorous growth; the reason for this tendency is unknown. Extensive burns, either thermal or radiological, can lead to unusually large<unk> s; these are especially common in firebombing casualties, and were a signature effect of the atomic bombings of Hiroshima and Nagasaki. True incidence and prevalence of<unk>  in United States is not known. Indeed, there has never been a population study to assess the epidemiology of this disorder. In his 2001 publication, Marneros stated that “reported incidence of<unk> s in the general population ranges from a high of 16% among the adults in the Democratic Republic of the Congo to a low of 0.09% in England,” quoting from Bloom's 1956 publication on heredity of<unk> s. Clinical observations show that the disorder is more common among sub-Saharan Africans, African Americans and Asians, with unreliable and very wide estimated prevalence rates ranging from 4.5 to 16%.
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