 Several NTDs, such as leprosy, cause severe deformities that result in social stigma.Stigma is considered to be the 'hidden burden' of neglected tropical diseases, and is not accounted for in measures such as DALYs.Other NTDs that carry heavy social stigma include onchocerciasis, lymphatic filariasis, plague, Buruli ulcer, leishmaniasis, and Chagas disease.