Big toenails growing into the flesh may be caused by ingrown toenails, nail trauma, squeezed by shoes and other reasons. 1. ingrown toenail: the main manifestation is that the edge of the toenail is embedded in the skin of the nail fold of the lateral edge, and the surrounding skin may appear red, swollen, painful and other symptoms. 2. Nail trauma: If the big toenail is smashed and other external injuries, it may lead to deformation of the big toenail and the phenomenon of growing into the flesh. 3. Squeezing by shoes: If the shoes are too tight and the big toenail is squeezed for a long time, the big toenail may grow into the flesh. It is recommended to go to the hospital in time to clarify the cause of the big toe nail to the flesh, to be disposed of accordingly, otherwise it is easy to lead to gingivitis.