Fingernail odor can also be caused by fungal infections. Although fungal infections are more common in the toenails than the fingers, they can also be present within the fingernails. Nail infections are extremely common. Dr. Raza Aly, professor emeritus of skin surgery at the University of California San Francisco Medical Center explains via LiveScienceAbout 50% of people who get nail fungus develop it by the age of 70.
Dr. Anna Chacon, a Miami-based board certified dermatologist, explains how nail fungus (medically referred to medically as onychomycosis) can leave your fingernails with an ongoing cheeselike odor (via Livestrong). Consult a physician if you suspect that you have a nail infection. Different treatment options may be available for nail fungus. Experts at the Mayo ClinicSome people may find that over-the counter creams are helpful, especially if the infection has been mild. Others may need prescription antifungal medication, nail polishes, and creams that are repeated over a prolonged period of time.