alt=A map of Africa, with shading predominantly in southern West Africa.<unk>  is relatively rare, with 2,713 cases reported to the World Health Organization in 2018. Most countries do not report data on<unk>  to the World Health Organization, and the extent of its spread is unknown. In many endemic countries, health systems likely do not record each case due to insufficient reach and resources, and so the reported numbers probably underestimate the true prevalence of the disease.<unk>  is concentrated in West Africa and coastal Australia, with occasional cases in Japan, Papua New Guinea and the Americas. In West Africa, the disease is predominantly reported from remote, rural communities in Benin, Côte d'Ivoire, Cameroon, and Ghana. Other countries in the region also have<unk>  to some degree; a 2019 systematic review of prevalence studies found a clear consensus that it is present in the Democratic Republic of the Congo, Gabon, Liberia, Nigeria, Togo, and South Sudan, as well as "strong" or "very strong" evidence of the disease in the Republic of the Congo, Sierra Leone, the Central African Republic, Guinea, and Uganda.<unk>  is regularly reported from Australia, where it occurs in coastal clusters—two in Queensland (near Rockhampton and north of Cairns) and two in Victoria (near Bairnsdale and Melbourne). It is more rarely reported from Japan, Papua New Guinea, and the Americas. Japan reports a few locally acquired cases per year scattered across the main island, Honshu. Papua New Guinea sporadically reports cases to the World Health Organization, typically less than a dozen per year. In the Americas, most<unk>  is reported from French Guiana, with few cases described in surrounding countries. A 2019 review found "strong" evidence for the presence of<unk>  in French Guiana and Peru, and "moderate" evidence in Brazil, Mexico and Suriname. Within affected countries,<unk>  tends to occur in rural areas near slow-moving or stagnant water. In particular, the disease tends to appear near water that has experienced human intervention, such as the<unk> ilding of dams or irrigation systems, flooding, or deforestation. Within endemic communities, few characteristics predict who will acquire<unk> . Males and females are equally likely to be infected.<unk> s can appear in people of all ages, although infections are most common among children between 5 and 15 years in West Africa, and adults over 40 in Australia and Japan.
Buruli ulcer
Lichen planus
Callous ulcer
Lichen sclerosus
Kangri ulcer
Lipschütz ulcer
Stercoral ulcer
Melanosis coli