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Medically referred to as syndactyly (a name that also refers to webbed fingers), webbed toes are described as two or more toes fused together. While it is normal for animals such as ducks and frogs to have webbed toes, it is not as common among humans. During early fetal development, all our toes and fingers are webbed together.
Dear Kato: Darkening of the toes that hurt could result from compromised blood supply to those toes, leading to a condition called gangrene. Gangrene may occur after an injury or infection, or in people suffering from any chronic health problems, affecting blood circulation such as diabetes. It also often occurs in the toes and feet of elderly patients due to arteriosclerosis, a condition also known as senile gangrene. Arteriosclerosis occurs when the blood vessels that carry oxygen and nutrients from a particular area become thick and stiff, many times ending up restricting blood flow, in this case to the toes. Also, over a long period of time, people such as those with diabetes may have a buildup of fats, cholesterol and other substances in the arteries which may restrict blood flow.