Paronychia

Paronychia is inflammation involving the folds of tissue around the finger nail or toe nail (1,2):

• disruption of the seal (the cuticle) between the proximal nail fold and the nail plate allows an entrance to the invading organism
• pus accumulates between the cuticle and the nail matrix. The area may be swollen, red and tender.

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:

• acute paronychia
• chronic paronychia (1)

Click here for an example image of this condition

Reference:

1. Leggit JC. Acute and chronic paronychia. Am Fam Physician. 2017 Jul 1;96(1):44-51.
2. Rerucha CM, Ewing JT, Oppenlander KE, Cowan WC. Acute Hand Infections. Am Fam Physician. 2019 Feb 15;99(4):228-236.