Yellowing of the nail cap of the index finger can be caused by smoking or exposure to chemicals, or it can be caused by onychomycosis. It is necessary to analyze according to the symptoms.
1. Long-term smoking: due to long-term exposure of nails to coal tar, nails are easy to yellow or black, and there are often symptoms of yellowing around the nails, which can be recovered after stopping smoking for a period of time.
2. Contact with chemicals: long-term contact with nitrates, sulfuric acid or other chemicals due to work and other reasons, people are prone to finger nail yellowing, most and the work of the hand protection is not sufficient.
3. ringworm of the nail: for a variety of fungi caused by the nail plate and (or) the subnail tissue infection of the unified disease, can lead to thickening of the nail plate, gray and yellow turbidity, uneven surface of the nail plate or broken and other symptoms.
Index finger nail cover yellow may also have other reasons, should be timely to the hospital, a clear diagnosis after standardized treatment.