it is likely an abscess. if it hurts, is red, etc. then it is infected and you should see a doctor immediately cause you have an infection.
if it is just a lump you feel and isn't getting bigger AND doesn't hurt then it is a sterile abscess which will go away on its own eventually hopefully, otherwise you need a doc but it isn't as serious.
if its the size of a baseball then yeah you should see a doctor that is pretty damn big and sounds like you whiffed on the muscle bigtime
who cares if they ask, not their business to ask.. their business is to make you better. you have patients right to keep your mouth shut at the doctor and not give information.