Toe Nail Fungus (Onychomycosis)
If one or more of your toe nails is discolored (yellow or brown), thickened, and difficult to trim, you may have a fungal infection. A less common type of infection turns the nail white, soft, and flaky. Although mostly a cosmetic problem, these infections can make the nail become loose and painful, leading to secondary infection, especially in people with diabetes or circulation problems. The dark, moist conditions underneath a nail promote the growth of fungi. Nail fungus is very common, found in up to 5% of the general population and almost half of people over age 70.
Evidence-based practice 11, no. 06 (2008)