Other possible causes of swollen lymph nodes. Cuts, burns, skin infections, rashes and insect bites may cause lymph nodes to get larger. Swollen lymph nodes on the front of the neck could mean your child has a cold or throat infection. Swollen lymph nodes in the groin could mean your child has an injury near their lower abdomen or legs. Swollen lymph nodes in the armpit could mean your child has an injury near their arms or upper chest. Swollen lymph nodes on the back of the neck could mean your child has an injury on their scalp. How to treat side effects of swollen lymph nodes