It started out around my left eye and then behind my ear and sometimes at the front of my head, always on the left side of my head. It happen when i eat some kind of food or when i get angry or stress, i have a cramp in my head or a tingling feeling then it happen. it is not a small lump, it is a large swelling, never any pain or reddish look, just a swelling. i am afraid of what it might be.