I am 21 yrs old, with in 4 months i have cervical laymphadenopathy in my neck, below the mandible & sternocledomastoid muscle, so please docoter help?

Should be checked : If the nodes are larger than 1cm and have been present for 4 months, you should see a physician for an exam. They could be inflammatory and antibiotics could be tried. If they do not resolve over a few weeks, a biopsy might be necessary to be sure this is not lymphoma or some other malignancy. Enlarged nodes should not be ignored although most are benign and of no concern.

See your PCP: for evaluation, tests, diagnosis and treatment if needed.