Is there a black line on your thumb nail cancer?

If there is a black line on the fingernail, it

may be caused by blood under the nail, fungal infection, nail nevus, etc. It may also be caused by cancer. Patients need to seek medical attention in time for histopathological examination. If the examination results show that there are cancer cells in the nail area, it is not cancer.

Patients need to keep the nail area clean and dry, and timely treatment should be given when lesions occur.