Why Topical Creams Alone Rarely Clear Nail Fungus

Nail fungus is a very common condition, but there's a lot of misinformation circulating about it. Caused by a fungus called dermatophyte that invades the nails, leading to yellowing or crumbling, nail fungus is common enough that many people have experienced it at least once. As a result, there are many unsubstantiated treatments circulating online as if they were facts. Today, we will correct common misconceptions and point out truly helpful approaches.

It is actually difficult to treat nail fungus with vinegar or glacial acetic acid. While acidic components can reduce surface fungi to some extent, the fungi causing nail fungus grow between the nail and the skin underneath, making them difficult to reach unless the nail is removed. In particular, glacial acetic acid is a strong acid that can cause ulcers on the skin if applied incorrectly, and more often than not, people come in with bigger problems after trying to remove the fungus this way.

Common folk remedies are also unlikely to be solutions for nail fungus.

• Garlic can cause skin irritation and inflammation like contact dermatitis.
• Baking soda only exfoliates to some extent and does not eliminate the causative fungi.
• Soaking feet frequently and for long periods in water can create a damp environment, which is favorable for fungal growth.

Oral medications are an effective option when taken with regular check-ups. Nail fungus medications are metabolized by the liver, so liver function needs to be monitored periodically, and the treatment period can be long as it takes time for the nail to grow out completely.

Removing the nail because it looks unsightly is generally not recommended. In most cases, nail fungus reappears on the newly grown nail, and improper removal can even lead to side effects like changes in nail shape. It is very dangerous to attempt to remove a nail at home and should be avoided. However, if the nail is severely deformed or deeply ingrown, it may be removed at a medical institution, followed by concurrent medication treatment.

If oral medication is not feasible, topical medications and lasers are practical alternatives. Many people find oral medications burdensome due to interactions with other drugs, such as cholesterol medication. In such cases, topical medications and laser treatment can be considered. Among topical medications, some effective products are available but can be costly, while lasers have the advantage of fewer side effects. The best approach is to combine both treatments.

For laser treatment, hotter is not necessarily better; adhering to the established protocol is crucial. The 1064 nm wavelength laser penetrates the nail to reduce the fungi underneath and helps the nail grow faster, pushing out the dead nail. However, simply increasing the temperature can cause side effects like burns, and if it's too hot, the patient will withdraw their foot. Therefore, both temperature and duration must be precisely controlled.

Thinning the nail by filing can be a helpful adjunct, allowing medication and laser to penetrate better. While filing alone cannot eliminate the fungus, a thinner nail makes it easier for medication to reach the fungi in the deepest layer. However, tools should only be used by the individual to prevent transmission to others. Also, since nail fungus is a fungal disease that thrives in humid summer environments, drying thoroughly is more important than just washing cleanly.

Written by Dr. Sang-Joo Lee, Medical Director (Yonsei Star Dermatology) · Medical Staff Introduction · Last reviewed 2026-06-03