<s>[INST] Hi I'm a 15 year old female and I noticed a round, hard lump under chin while I was washing my face the other day. It doesn't hurt, which is scaring me that it might be cancer, except I have no family history of cancer. I was told that it could be a blocked salivary gland... [/INST] Hi, dearI have gone through your question. I can understand your concern.You may have siledenitis( infection in salivary gland), or sub mandibular lymphnode enlargement. Chances of cancer at age of 15 is very rare. SO don't worry much about that. You should take a course of antibiotics. If it does not respond to treatment then ultrasound study and biopsy is advisable. Consult your doctor and take treatment accordingly.Hope I have answered your question, if you have any doubts then contact me at bit.ly/Drsanghvihardik, I will be happy to answer you.Thanks for using health care magic.Wish you a very good health. </s>