Last night I noticed a small dime-sized bump about an inch behind my left ear that hurts when touched. I do have allergies and cold symptoms, but the cold has lasted long before the lump. I can move my head about, but when I do I feel pain around the lump. When I am just relaxing, though, I feel no pain at all. I do not and have not experienced night sweats, but I have lost six pounds in the last three months. I have not eaten as much as I usually have, but I'm still worried. It feels hard, but I can push it away. Please reply promptly! Other info: I am a regular, usually healthy 13 year old girl and have had no bumps or lumps in the past