Toenails turn purple generally because of trauma caused by bleeding under the nail, and finally bleeding under the nail gradually oxidize slowly, resulting in the purple display. Then this time the main reason is because wearing shoes is relatively small, nails are squeezed, in addition to the foot kicked to which place, has suffered a slight trauma or kicking the ball when their own force is not appropriate, as well as to do some running time of the nail bed by the extrusion of the time, the emergence of the nail under the hemorrhage. Do not panic at this time, subnail bleeding generally does not require special treatment, just need to soak your feet in warm water to promote the slow absorption. There are also cases where the nail bed is slowly squeezed up due to excessive bleeding under the nail, and the nail is slowly replaced, which is also a common phenomenon. Of course, if the bleeding under the nail becomes purple for a long time without absorption, in the formation of pus under the nail, this time you need to carry out nail extraction disposal.