Great work by Dr Kebede Deribe, at the University of Sussex and Addis Ababa University, who have funding from the Wellcome Trust to develop a global atlas of podoconiosis over the next 5 years. While there are estimates that put the figure as high as 4 million people, it is difficult to accurately assess the number of podoconiosis patients around the world because the diagnosis of this disease is challenging.
http://www.sciencedirect.com/science/article/pii/S2214109X17301407