I'm 15 years old, female,and found a lump on my neck not long ago. It's small and sort of firm, but not hard. It is located on the upper right side of the back of my neck, close to my hairline. There is noticable but not unbearable soreness if pressure is applied to it. It has been there for a while, but not exceeding two months. It seems to have gotten smaller since I found it. I haven't been experiencing any symptoms that worry me. I recall first finding it at the start of the time when I usually begin to get allergy symptoms every year, sometime after the rest of my family. I don't feel ill, but still I feel this may be cause for worry. Is it?