Dec 15, 2019 - Black nail community. Share you most favorite black nail art ideas. All seasonal ans casual nail art. Please don't spam an pin not more than 10 pins a day. HAPPY PINNING. See more ideas about Nails, Nail designs and Cute nails. Why are your toenails black? A fungal infection, trauma, or even an underlying condition like kidney disease can be the cause of your black toenail. There are many causes of black or dark toenails, but the most common cause is trauma. When trauma occurs to a nail resulting in discoloration it is referred to as a subungual hematoma, which simply means there is a collection of blood underneath the nail. More seriously, a black line or lines on the nails can indicate the presence of melanoma, a dangerous form of skin cancer. Melanoma under a fingernail is known as subungual melanoma. Nail pigment bands or melanonychia are quite common in people who have dark skin. It is estimated that 70 percent of African Americans over the age of 20 have nail banding and almost all African Americans over the age of 50 have some type of nail pigment discoloration. Find and save ideas about black nails on Pinterest.