Paronychia (pronounced: par-uh-nik-ee-uh) is an infection of the skin around a fingernail or toenail. The infected area can become swollen, red, and painful. Sometimes a pus-filled blister may form.
Most of the time, paronychia is no big deal and can be treated at home. In rare cases, the infection can spread to the rest of the finger or toe. When that happens, it can lead to bigger problems that may need a doctor's help.
You're not likely to get paronychia in a toe (unless you have an ingrown toenail). But fingernail paronychia is one of the most common hand infections there is.
Paronychia usually happens when the skin around a person's nail is irritated or injured. When the skin around the nail is damaged, germs can get in and cause an infection. These germs can be bacteria (causing bacterial paronychia) or fungi (causing fungal paronychia).
Common paronychia causes include:
Some people get paronychia infections after a manicure or using chemicals like nail glue. Certain health conditions (like diabetes) also can make paronychia more likely. And if your hands are in water a lot (if you wash dishes at a restaurant, for example), that ups the chances of getting paronychia.
Chances are, if you have paronychia, it will be easy to recognize. There will be an area of skin around a nail that is painful and tender when you touch it. The area probably will be red and swollen and feel warm. You may see a pus-filled blister.
If the paronychia has been there a long time, the nail may turn a different color. It might not be its usual shape or might look as if it's coming away from the nail bed.
If paronychia is mild and hasn't started to spread beyond the fingernail, you can probably treat it at home. Soak the infected nail in warm water for 20 minutes a few times a day. The infection will probably heal on its own in a few days.
If paronychia doesn't get better after a week or so, call your doctor. You'll want to call a doctor right away if you have an abscess (a pus-filled area in the skin or under the nail) or if it looks like the infection has spread beyond the area of the nail.
If paronychia becomes severe and you don't see a doctor, infection can spread through the finger or toe and move into the rest of the body. Luckily, this is very rare.
Usually, a doctor or nurse practitioner will be able to diagnose paronychia just by examining the infected area. In some cases, a doctor may take a pus sample to be examined in a laboratory to determine what type of germ is causing the infection.
If you have diabetes, let your doctor know if you notice any signs of paronychia, even if it seems mild.
Don't try to puncture or cut into an abscess yourself. Doing that can lead to a more serious infection or other complications. The doctor may need to drain the abscess and possibly prescribe antibiotic medications to treat the infection. Once an abscess is treated, the finger or toe almost always heals very quickly.
If someone has fungal paronychia, a doctor may prescribe antifungal creams, lotions, or other medicines.
Here are some things that can lessen your chances of developing paronychia:
As much as possible, try to avoid injuring your nails and the skin around them. Nails grow slowly. Any damage to them can last a long time.
Reviewed by: Elana Pearl Ben Joseph, MD
Date reviewed: March 2012
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