Lymph node in groin. Can it be cancer?

I am feeling 2 small about 1 cm lymph node in my groin. It's almost 1 year since I am having them. I am also having 1 small arround 1cm lymph node in my throat and 1 arround 2 cm lymph node in back of my neck. I have consulted with an ENT specialist for this and he has prescribed some medicine (jiboxim-200, xyzalm and phlogam) for three weeks. This is the second week running but I am still having the lymph nodes. I have taken lots of rabies vaccine arround 45 starting from 2013 to 2018 can this cause these lymph node to appear. How long it can take to go away ? and can it be cancer ? I am not having fever or night sweet and I am little fat and not loosing any weight. I am very much tensed about the cancer as I have read about them over internet. Please suggest what should I do. Any suggestion will be helpful. Thanks in advance Monojit