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He was diagnosed with a severe case of paronychia, or the infection of the skin around the nail, and was told he required emergency surgery to remove the affected flesh.

Long-term, habitual nail nibblers can also suffer from a type of infection called paronychia, Scher says.

This is well exemplified in the internal and superficial paronychia, one of which is attended with great pain and fever, and the other with little pain and no fever.

As the result of lateral deviation of growth, the nail presses upon the surrounding tissues, producing a varying degree of inflammation—paronychia.

Hence light is as intolerable in this kind of ophthalmia, as pressure is to the finger in the paronychia.