This symptom does not exclude the gray nail caused by, specific need to do a fungal microscopy to determine the next. If the test result is positive, then it is a fungal infection of gray nails, need timely treatment, you can use potassium permanganate solution or ten percent of glacial acetic acid foot soak, but also can use medication, such as naphthol ketoconazole cream or compound clotrimazole cream and other medications coated. If it’s not gray nails, it may be caused by lack of nutrition and calcium, which need to be supplemented in time.