Chemotherapy may cause a person’s nails to turn:

Fingernails and toenails turning black. By far the most common cause of darkening nails is chemical exposures changing the colors of the nails. Web however, mold or yeast can also infect toenails. More serious causes include heart disease or melanoma.

The discoloration may be brown or black and can be a natural occurrence in people with dark skin. The condition can cause brittle, soft, splitting, or thin nails. This usually results from an impact or trauma to the finger which can cause considerable pain.

Causes common causes of brittle nails. If you have nail fungus, your toenail color might be: Web there are several possible causes of a black nail without injury:

Web causes treatment complications diagnosis if you notice a toenail becoming discolored and turning black, it's often due to injury that causes a bruise called a subungual hematoma. There can be other reasons for discoloration, however, and black toenail can. You will need to see your primary care doctor or your dermatologist, however, to help you get to the bottom of this.

Web black toenails can result from a trauma, a fungal infection, or pigmentation changes over time. While these are usually brown or yellow, they can turn black due to. Web melanonychia is a brown or black color in your nail.

Web a black fingernail is known as a subungual hematoma. Web if your toenail turns black, it’s most likely a bruise under the nail, technically called a subungual hematoma. It can affect your fingernails or toenails.