Fungi thrive in dark, warm, and moist environments, which is why fungal toenails often worsen when feet are constantly covered by socks and shoes. Sunlight helps reduce moisture and creates an environment that is less favorable for fungal growth, while also supporting overall skin and nail health.
When possible, allow your feet and toenails to get brief, direct sunlight exposure. Even 10–15 minutes a few times per week can help keep nails drier and healthier. Combine sunlight with proper nail trimming, clean socks, and breathable footwear to support long-term improvement.
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