I wish I could be more helpful. It could be swelling pinching on a nerve, the beginning of osteoarthritis or an injury. If it is really painful, you should go to urgent care for an xray otherwise wait and call your primary care provider tomorrow to schedule an examination and probably an xray

All your symptoms are derived from the injuries you suffered one year and four years ago.Apparently, they were not sufficiently treated and the residual injuries wouldremain for a life time without spontaneous improvement. Most likely you irritatedthe residual injuries and added some new injuries along the way because of constantirritation from ongoing activities. Pain may come up from time to time when theinjuries are aggravated, even without an apparent new injury. Painful sites arethe injured sites. Your pain and weakness comes from soft tissue injury musclefasciastrain, regular pain being from muscle and sharp pain from fascia, but it is neverrelated to the nerve. The slight bump was formed by the strained and thus tightenedfascia tissue. Those jammedup tissues, like tangled hair, must be untangled tobe painfree. Any treatments medication, hotcold, electrotherapy, massage, manipulation,stretching, strengthening, acupuncture, etc. not untangling the jammeduptissues are deemed to be ineffective. The only effective treatment is TouchandHoldof The Precision Method to initiate selfreleasing internally by thebody itself. It can be cured in 36 hours. This is detailed in my bookNO MORE PAIN  All Pain Considered A Breakthrough. Pleasevisit my website NoMorePainClinic.com

Because you are 17, I can say that it needs further evaluation. If it causes pain up to the shoulder it is likely the neck or thoracic outlet region. Something can move out of place due to further trauma, but, not as likely. There is likelyhood that the bump is related to irritation in the nerve or a fatty lipoma