<s>[INST] Hi, this morning i touched my neck and i felt something strange, its under my jaw on the right side of my head. It s about the size of a pea, i looked things up and it sounds to me like its a swollen lymph node. I smoke marijuana, its usually daily but there are just a couple days when i dont. I just noticed it this morning. I havent smoked at all today because i read some things online. I want to know what i should do? [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have some enlarged lymph node.  It may be due to reactive hyperplasia., tuberculosis or lymphoma.  However, most common cause is reactive hyperplasia. You should take a complete course of antibiotics. If it doesn't respond to treatment then biopsy diagnosis is advisable.  Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. </s>