Some lymph nodes were found in my neck and groin. is this serious?

Maybe: Usually, lymph nodes become enlarged in response to an infection, but other possible causes include lymph node malignancy such as lymphoma or hodgkin's disease. And some infections can be life-threatening too. Sometimes a trial of antibiotics can be successful in reducing enlarged lymph nodes. Failing this trial, a biopsy might become necessary.

No, but...: Lumph nodes are an important component of our immune system. Once we have an infection, white cells combat the "invader" and recruit other cells in the lymph nodes and elsewhere to help heal you. The lymph nodes get swollen during this event. Areas of lymph nodes drain from different parts of body. This can be normal, but should be watched by your local doctor.

Possibly: I recommend a complete blood work up by your dr.. It could be minor or serious. Don't delay!

Ask your doctor: This is something that you should discuss with the doctor who found the enlarged or tender lymph nodes. Everyone has lymph nodes throughout their body. How to proceed, if at all, will be determined by your physician based upon all his\her findings. This is not something that can be answered easily by a simple answer over the internet with limited information.