It can feel worrying when you notice a lump on your child’s neck, under the jaw, behind the ear, in the armpit, or near the groin. Some children may say the area feels sore, while others may not seem bothered at all. Swollen lymph nodes in children can happen when the body is responding to infection or inflammation. Lymph nodes are small glands that form part of the immune system. They may become more noticeable during or after common childhood illnesses such as colds, sore t