Peronychia is a purulent infection of the tissues surrounding the nail caused by a minor local injury, starting with redness, swelling and severe pain on one side of the nail or at the root of the nail, and then gradually turning into pus, forming a subnail abscess when it accumulates under the nail, and chronic inflammation after it breaks down due to poor drainage of pus. After suffering from periungitis, purulent infection of the tissues around the nails, starting with redness, swelling and severe pain on one side of the nails or at the root of the nails, and then gradually pus, and when it accumulates under the nails, it will form a subnail abscess, and after it breaks down, it is often due to unsmooth drainage of pus, which results in a chronic inflammation. So, what are the common examination methods to diagnose periungualitis? The following is an introduction to the common examination methods used to diagnose periungual inflammation: Examination: bacteriological and fungal examination of secretions taken with a swab, and spot sticker test if necessary. Early treatment of periungitis is the key to the whole treatment. Doing treatment before the local inflammation spreads, or as soon as the toe (finger) is localized, can shorten the course of the disease. Therefore, it should be treated as soon as possible once diagnosed.