I just noticed a lump behind my left ear and the pain is down my neck would u know what it could be?

Possibly lymph node. You will need this examined to see what it feels like and exactly where it's located. It could be an enlarged lymph node from an infection and cancer has to be ruled out.
Lymph node. If you any infection in your mouth or scalp it may be an infected node. You may feel the node every couple of weeks, if the lymph gland doubles in size, becomes painful, ulcerates, or other nodes become enlarged, or you develop fever, or lose weight, you should see a doctor.

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