<s>[INST] Hi, may I answer your health queries right now ?  Please type your query here... hi, im a 15 year old male. about a year ago i noticed a small pea shaped lump sort of thing under my skin the back of my neck under the hair line. it is no more than a centimeter long. it causes no pain/redness/itching. it is just there. it should also be noted i live a pretty stressful life so i am wondering if this might have anything to do with it. [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have enlarged posterior occipital lymph node due to reactive hyperplasia or some soft tissue tumor. You should go for examination. If needed to take a course of antibiotics. If it doesn't respond to treatment then biopsy diagnosis is advisable. Consult your doctor and plan accordingly. 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>