Dirt, poor hygiene, and living in a humid area are all causes of a fungal infection in your toenails. Fungal toenail infections can cause discoloration, making your nail appear any of these colors: Yellow. Red-brown.
Why do toes turn purple?
Not getting enough blood damages cells and the tissues they make up. This can cause the tissue to change color — usually blue or purple. When this happens to the toes, doctors call it blue toe syndrome. Some people with this condition have just one discolored toe on one foot.
What is the white hard stuff under my toenails?
Keratin is a protein that promotes the development of the skin and nails. Nail psoriasis sometimes causes too much keratin to grow under the nail. This overgrowth is called subungual hyperkeratosis. People with hyperkeratosis may notice a white, chalky substance under the nail.