The FDA has determined that topical treatments applied directly to the fingernails, skin, and toenails are not effective in eliminating fungal infections.

• A. True
• B. False
• C. Depends on product
• D. Only for toenails

Answer: (A)

The idea being tested is why topical antifungal products often fail to completely clear fungal infections when they’re applied to nails, skin, or toenails. Focusing on nails, the problem is that the nail plate is a hard, densely packed barrier. Fungi that cause infections live beneath or inside the nail plate (in the nail bed and matrix), and topical medicines have a hard time penetrating enough to reach them in adequate concentrations. Because of this limited penetration, topical treatments frequently don’t fully eradicate the infection in the nail, which is why systemic (oral) treatments are often recommended for nail infections.

For skin infections, topical antifungals can be effective when the infection is on the surface and accessible, but the statement is addressing the broader claim and emphasizes the common issue with nails. That’s why, in practice, nail fungal infections are the ones most often cited as not being reliably eliminated by topicals alone, which aligns with the idea that these products are not universally effective across all sites.