<unk>  has been described as a disease of the 'poor and hungry'; it may be that slowly improving socioeconomic conditions and nutrition account for its decline. Urbanization of populations could be another factor, as a<unk>  is usually a rural problem. More widespread use of shoes and socks also provides protection from initiating trauma. Despite this, susceptible individuals still develop<unk> s. Sometimes outbreaks can occur; one was recorded in Tanzania in sugarcane workers cutting the crops while barefoot.<unk> s can also occur to the visitors of tropics. The disease is most common in native laborers and in schoolchildren of the tropics and subtropics during the rainy season and is caused in many instances by the bites of insects, poor hygiene, and pyogenic infections. Males are more commonly infected than females. Geographic distribution<unk>  is seen throughout the tropics and subtropics. In some of these countries, such as northern Papua New Guinea, it is the most common skin disease.
Tropical ulcer
Callous ulcer
Kangri ulcer
Stercoral ulcer
Cushing ulcer
Mouth ulcer
Buruli ulcer
Lipschütz ulcer