Problem: Yellow Toenails
Unless you've recently experienced acute trauma (like dropping your golf clubs on your toes), it’s likely that your thick, yellow toenails are caused by the fungus onychomycosis, which you can pick up walking barefoot around damp, contaminated surfaces such as a locker room or public pool, DeSantis says. The good news: You can treat it. The bad news: It's stubborn.
The Solution: OTC antifungal sprays and topical ointments, such as Lamisil ($17.50, walgreens.com) and Tinactin, are a good place to start, but many cases are stubborn enough to warrant seeing your doc. "We use a combination of topical anti-fungal creams and laser to remove the fungus," DeSantis says. Also, make sure any dark spots under your nails that you think are fungus, actually are. "We are seeing a growing number of men coming in with what they think is fungus, but turns out to be melanoma," DeSantis says. "It is critical to apply sunscreen to your feet, especially in the summer."