How to clear a swollen limpnode from underarm?

Time: Enlarged axillary lymphadenopathy (what you have) is usually related to inflammation further down the arm. It should slowly decrease but if not or if it continues to enlarge, see your doctor.

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.