Where are inguinal lymph nodes for?

All over the body: Lymph nodes, sometimes incorrectly called "glands" & are a vital part of immune system. They filter out foreign particles including bacteria and malignant cells. Can limit spread of infections. Can become enlarged with infection or cancer cells. Which is useful for "staging" tumors. However, enlargement, especially in children, is benign more often than not. Always consult your dr. When in doubt.

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.