How to deal with swollen lymph nodes in my armpit and groin area?

See a doctor: Lymph nodes can be enlarged for many reasons. The cannot be dealt with until the cause is found. A doctor's visit is necessary to establish the reason for the enlarged nodes.

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells/digested food. Lymph nodes "taste" the lymph everywhere for bad stuff 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.