Answer Since I am not a Doctor answering your question could do you more harm than good so if it's not too much to ask of you, please go see a Doctor. He or she will be able to answer your question,...
The word lump is a very general, undescriptive word. With such a lack of description, one cannot give you a definite answer. If you want a proper opinion, then get a proper examination...in person...
A lymph node.
Sometimes (thou rarely) a lump behind the lower part of the ear can be a cyst or a tumor of the parotid gland. Again this is rare and shows up mostly in men above the age of 50, but...
Could be anything. Could be a muscle knot, could be a cyst, could be a benign growth of tissue, could be worse. Could be something else. Get to a doctor. You need someone with experience to examine...
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