Any lump that is new anywhere in your body needs to be checked by your doctor. Chances are it's nothing but you never know. You could have maybe torn something in the muscle or it could be many things. You may have a ruptured tendon or ligament that needs medical attention.
Consult your doctor about a new lump anywhere on your body. Chances are very good that it is nothing but you won't know unless you have it checked out.
When concerning a lump in your body the best idea is to consult a doctor. One could list off numerous things it could be, only your doctor should tell you.
If it is painful or has you worried then you should go in and see your doctor otherwise it could just be a somethin torn or swollen and in that case it takes time.