There are many causes of purple big toe sprain, including trauma, vasculitis, fracture and other factors related.
1. trauma; due to the local blood circulation disorder caused by the sprained big toe, the blood accumulates in the big toe, because the red blood cells are red and show purple color under the skin, which can cause the purple of the big toe.
2. Vasculitis: due to the existence of thromboembolic vasculitis, coupled with the sprain of the big toe, causing the accumulation of blood in the lower limbs, resulting in purple big toe and local pain.
3. Fracture: due to the big toe fracture when the big toe is sprained, the blood is free from the blood vessels, followed by the emergence of local hematoma, due to the accumulation of blood and therefore purple.
There are many causes of purple big toe sprain, such as gingivitis, etc., please consult a doctor in time to clarify the cause of the disease before treatment.