The common indicators of toe nail fungus infections are noticeably thicker nails, abnormally shaped toe nails, significantly dark nail pigmentation and sometimes rotten smelling toes. Trauma following an accident where your toenail is struck hard by something, the fungi then gets in via the broken nail bed. When the fungus enters the nail it could then play host to them. Injury, a favorable environment, an inadequate immune system and poor blood flow all add to the establishment of toenail infections. Optimal therapy includes taking both topical and oral medicine for as long as 6 months to completely eradicate the fungus.