Paronychia (pahr-uh-NIK-ee-uh) is an infection of the skin around a fingernail or toenail. The infected area can become swollen, red, and painful, and a pus-filled blister (abscess) may form. Most of ...

including their treatment options and when to get help from a doctor. Nail fungus affects toenails more often than fingernails, with the infection typically developing on the big toe first.