Ajin: Demi-Human is a Japanese manga series written and illustrated by Gamon Sakurai. It was adapted into an anime film trilogy by Polygon Pictures between November 2015 and September 2016. An anime television series adaptation also by Polygon Pictures aired between January and April 2016, with a second season premiering on October 8, 2016. A live-action film adaptation was released on September 30, 2017.
According to Banner Health, cellulitis and circulation problems, also known as venous insufficiency or venous hypertension, can cause the lower legs to turn red. Circulation problems lead to a variety of conditions that can make all or part of the lower legs turn red, according to the American Diabetes Association.
Chronic athlete's foot can cause an increased pigmentation to the bottom of the foot. It is associated with dry scaling skin and may have a reddish appearance. Venous Stasis. Generalized increased pigmentation occurs for a variety of other reasons. Dark patches of skin occur about the ankles and lower legs in persons who suffer from Venous Stasis. Venous stasis is caused by an accumulation of fluid in the lower extremities. This is due to poor venous return of blood to the heart. Venous blood flow back to the heart occurs by way of the veins in the feet and legs.