Nail discoloration, in which the nails appear white, yellow, or green, can result from different infections and conditions of the skin In about 50% of cases, discolored nails are a result of infections with common fungi that can be found in the air, dust, and soil There are many species of fungi that can affect nails The most common symptom is severe, throbbing pain It happens because of the pressure of blood collecting between the nail and the nail bed You may also have A darkcolored discoloration (red,Blue fingernails or purple nail beds can be a sign of various disorders and should be investigated In the case of Raynaud's disease, the fingers and toes blanch on exposure to cold, then turn blue and may become numb or painful
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