On Saturday, I noticed a small, blood filled bump on my inner arm. It did not hurt or itch. On Monday, I accidentally scratched it and it started to bleed, a lot. I cleaned it and it continued to bleed so I wrapped in with gauze and taped it. Hours later, i unwrapped it and it started to bleed again and I rewrapped it loosely, this morning it had bled onto my bedsheet. After taking a shower, it was still bleeding, so I wrapped it again and it stopped, but now I unwrapped it and it pulled the dried blood and it has started to bleed again, a lot. This kind of concerns me because I don't know what it was/is and why it continues to bleed so much. What could this be and what should I do? It did not look like a mole.