What is the problem with black nails?

The nail is black, first of all to see if there is too much extrusion and bruise, causing local congestion. At the same time may be accompanied by pain, generally if the injury is not serious, with the passage of time may gradually improve. If the performance of black spots or black lines, color uniformity, consider for the nail mother mole, can be observed without treatment. If the nail has small black spots at the beginning, gradually become larger with the passage of time, especially showing ulceration, consider the possibility of melanoma, to go to the hospital in time for pathological tests. Of course, some outdoor workers may also be exposed to chemicals, causing nail color changes.