Hi! So, I Was Looking Over My Shoulder, To The

Hi! So, I was looking over my shoulder, to the person next to me, ahs I noticed this tiny protrusion on my upper arm. I looked closer and lightly pressed on it to observe it and... it's just like I have a frozen pea under my skin. There is absolutely NO pain, NO color (as, if you were to look at it straight on, it blends completely into my skin and you can't even see it), and in the couple of months I have had it, it had not changed in size one bit. Now, I did look at it under a bright light and it looks as if there's apin prick hole right in the center of the lump. I started to wonder if something had stung me... but.. no pain, no swelling, no redness... Any ideas?? I DO have a family history of cancer among the women, but I really don't feel that this has anything to do with that... at least, at the age of 31, I sure hope not. Thanks so much!