According to doctor there is lymph node infection it has been 5 days i am taking medicine but condition is worse now it is swollen and tender .?

Lymph nodes: Swollen and tender lymph node certainly can be the manifestation of inflammation or infection. Viral or bacterial could be the caused. Be patient, it may take up to 1-2 weeks before it is gone. However, if it is getting bigger or does not go away after 4 weeks- you definitely should talk to your doctor as further evaluation and a biopsy may be needed.

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.