Black clumps in the grooves of a cat's nails are usually because they are too dirty. Although cats don't go out much, dust accumulates in the nail grooves over time. If the owner doesn't clean them, the nail grooves will get dirty. In this case, just trim the cat's nails and then wipe them clean with a wet wipe.



However, if in addition to black lumps in the grooves of a cat's nails, there are also signs of hair loss, red and swollen skin, and itching, it is necessary to consider whether it is a skin disease caused by parasites, fungi, or bacteria.