Paronychia is inflammation involving the folds of tissue around the finger nail or toe nail (1):
It is the commonest type of hand infection, accounting for about a third of Accident & Emergency hand infections, most progressing to some form of surgical intervention.
Infection involving the eponychium is termed eponychia; extension of infection from one lateral fold to the other is termed a run-around abscess.
Non infectious causes include contact irritants and excessive moisture (2).
Clinically, paronychia can be divided into:
Click here for an example image of this condition
Reference:
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