An ingrown toenail is a painful condition in which the nail grows into the flesh, rather than over it. It commonly happens to the big toe and could be a result of injury, shoes that do not fit well, or improper nail care. People with diabetes need to be especially careful to avoid foot problems such as this. Symptoms include pain, swelling, and redness. Sometimes pus develops. Home treatments include soaking the foot in warm water, wearing loose-fitting shoes, and attempting to lift the corner of the nail that is ingrown. Medical treatments may include surgery. Follow the links below to find WebMD's comprehensive coverage about what causes an ingrown toenail, what it looks like, how to treat it, and much more.