I had my lump palpated by a surgeon; I had an ultrasound; and I had a CT scan.
All came to the same conclusion: there is nothing there but normal tissue. Not even a cyst to be drained.
(I had once had a lump on my neck aspirated as an out-patient.)
I tell you this as a follow-up to my panic and to the panic I hear on these forums. I was driving myself crazy.
My doctor also said that none of us is completely symmetrical, and that what appears to be a lump can sometimes be merely an aberration.
Things are ok here.
My best to everyone, with the hope that you do not delay seeking a medical opinion and tests out of fear. Fear drove me to have more than one test or opinion.