Thick, yellow toenails left so long they split and crumble. Nails so misshapen they dig into the skin, causing infections. Or, in the most severe cases, curling into what we call ‘ram’s horns’ that ...
Verywell Health on MSN

What causes yellow toenails?

Medically reviewed by Sarah Richards, DPM Key Takeaways Yellow toenails are most often caused by a fungal infection. Fungal ...