Causes include skin infections (such as athlete's foot). A rash (such as poison ivy) can do the same. Causes include skin infections (such as impetigo). The lower face may also be swollen on that side. This causes a swollen, tender node under the jawbone. Most often, it's the node that drains the tonsil. It can be quite large over 1 inch (25 mm) across. A swollen node with a bacterial throat infection is usually just on one side. The swollen nodes are usually ½ to 1 inch (12 -25 mm) across. This is the most common cause of swollen nodes in the neck. This is because of the many respiratory infections that occur during childhood.
The cervical (neck) nodes are most commonly involved. Normal nodes are usually less than ½ inch (12 mm) across.It's larger than the same node on the other side of the body.Also, includes swollen lymph nodes in the armpit or groin.Increased size of one or more lymph nodes.