An epidemic is defined as occurring when "new cases of a certain disease, in a given human population during a given time period, substantially exceed what is expected based upon recent experience." Pediatric obesity has reached epidemic proportio...

Meleda disease is an extremely rare inherited skin disorder characterized by the slowly progressive development of dry, thick patches of skin on the palms of the hands and soles of the feet (palmoplantar hyperkeratosis). Affected skin may be unusu...