<s>[INST] Hi im a 21 year old female. i recently notice a hard lump under my left collarbone. i went to the doctor and she told me it was a muscle. but it feels swollen. i do press on it alot. is it normal to have an upper uneven chest with muscles even if  i dont work out? i also started to press on my right side too and i feel a lump. it feels like a bone. but  i dont know. if  i keep pressing on my upper chest, is it possible im just causing harmless pain to it. do i have anything to worry about? [/INST] Welcome to Chat Doctor .1. You said that a doctor has examined and said its muscle mass, but you still feel that there is something there. 2. In this case what I would recommend is get a chest x-ray (PA view / Picogram) and ultrasounds scan of the muscle / lump area (gives us exact content and involving structures)3. No uneven muscle without workup is not possible.4. If it is not painful and not causing discomfort - you can ignore.5. If you do have symptoms, get the above-mentioned investigations done - They will help you to conclude and confirm. Hope it helps you. Wish you a good health. Anything to ask ? Do not hesitate. Thank you. </s>