Fungi will often cause the area around the nail to become red and irritated. Initially a fungus will take hold at the base or edges of the nail. Once the infection continues to spread you'll notice changes in your nail and nail bed. You may experience mild discomfort, itching, or perhaps even sharp pain around the cuticle which is the skin surrounding the nail. Bleeding may begin to occur and often detachment from the cuticle to the nail may result. The nail will begin a slow transformation to perhaps a yellow, brown, or white coloration. Nails will often become thicker and extremely brittle. You may experience discomfort when you put weight on any fungal infected nail.