PharmaSmart Pharmacy

If your nails have a yellow hue, it could be as simple as the nail polish from your last manicure or pedicure staining the nail plate. But occasionally, yellowed nails can also signal an infection or a more serious underlying problem like thyroid condition or diabetes.

Three ways to treat yellowed nails at home:
1/ If your nails are discoloured due to a minor yeast infection, treating them with tea tree oil may help. Mix a few drops with a carrier oil, like coconut oil, and swab onto the affected nails.
2/ Soaking your toes in warm water with a scoop of baking soda can help prevent nail fungus from spreading and remove yellowing, too.
3/ Soaking your fingertips in a mixture of baking soda, hydrogen peroxide and warm water can clear up stains caused by dark nail polish.

https://www.healthline.com/health/yellow-nails