The fingernail serves multiple functions. In addition to protecting the fingertip, it provides tactile sensation, aids in thermoregulation, and assists in picking up small objects; it also has dense lymphatics in the hyponychium that help resist infection. The fingernail is the most frequently injured portion of the finger secondary to its prominent location. The nail is also susceptible to infection and may be the site of tumors, both benign and malignant. Last, the nail may display signs of underlying systemic disease.
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