Toenail is an infection that comes into your nail through cracking or skin wounds. The nail may change color or get thicker. It can hurt as well. Due to the frequently warm and damp toes, there is a good growth of fungi. Various fungus types and yeasts sometimes infect various sections of the nail. Left without treatment, an infection may spread to other toenails, skin or fingernails. You’re going to want a doctor to inspect your toenail.