Black mold in fingernails is a rare condition known as onychomycosis, which is a fungal infection that affects the nails. It can cause the nails to become discolored, thickened, brittle, and can sometimes emit a foul odor. While various types of fungi can cause onychomycosis, it is uncommon for black mold specifically to be the culprit. However, if you suspect you have a fungal nail infection, it is best to consult with a healthcare professional or a dermatologist for an accurate diagnosis and appropriate treatment.
