A fungal nail infection presents as thickening of the nail, often with a yellow, brown, or chalky white tinge. Once a fungal infection begins, it can be difficult to manage, hence the importance of taking steps to prevent an infection in the first place. WebMD offers the following prevention tips: be careful around fungal hotspots by wearing shoes in locker rooms, at swimming pools, or in public showers; clip nails carefully to avoid skin cuts, which invite infection; and clean your nails with soap and water, using a nailbrush if needed. WebMD, July 2021