Is this a spider bite?

1 week ago I had a patch of dry blood at the top of my neck right into my hair line. The blood was about the size of a dime and, and when I wiped it away I could barely see a pin sized hole from where the blood came out. It wasn't sore at all, and there was no bump. There was no evidence at all that could explain why I bled there. Well, 2 days later, I felt a little sore bump in my neck next to the area where I bled. It's not a huge bump and not even visible because it's underneath the skin. There is no visible irritation. A few days later, and the bump is still there and only kind of hurts when I push on it, but I woke up and the pain is starting to spread up my neck and the back of my head. It's not painful unless I push on it, and even then it doesn't hurt that bad, it's just a little sore. It doesn't feel like a a sore muscle, but more like a fluid pressure pain. This is the second time ever that I mysterious had blood come out of the back of my neck with a pin sized hole. The first time, there was no soreness so I never questioned it. It has now been 1 week, and I'm starting to get nervous not knowing what is going on. I don't think its a spider bite or anything because like I said, there is not outside sore or irritation. Any one have a clue what this is?