Nail fungus is very common on toenails, but it doesn’t mean that you can’t get it on the fingernails as well. Nail fungus on the finger has the same cause and symptoms as fungal infections on the toenail. It is caused by a microscopic organism: dermatophyte fungus. Infection begins as a white or yellow spot and will cause the nail to discolor, thicken, and become brittle. The fungus can be very infectious and spread easily.
The fungus more likely infects the toenails than fingernails because toenails are often in moist and dark environments like socks. Fingers are rarely in moist and dark environments, making it less vulnerable to fungal infections. Toes also receive less blood flow than fingers which makes it harder for the immune system to detect and fight the infection. It could initially infect one toe, then spread to the other nails or to the fingernails. So when you detect any fungus infection on your fingernails or toenails, consult your healthcare provider or local podiatrist for treatment