What it is: “Most cases of yellow toenails are caused by fungal infections,” says Dr. Youner. “To get rid of the fungus and also eliminate the source of contamination, preventative measures include using antifungal powders on both feet and in shoe gear.” Because fungus grows in dark, moist places, the inside of your shoes are a prime breeding ground. The good news: Sandal season can naturally help you reduce the time your toes spend in fungal hotbeds.
How to treat: Options include laser treatments, nail thinning, and oral medication, all of which you can receive via your foot doc. “Topical OTC meds work best on new, superficial fungus, but they don’t have a great success rate,” says Dr. Zinkin. “Oral medication works better because they attack the issue from the inside-out.”